{"id":42398,"date":"2026-10-12T10:50:30","date_gmt":"2026-10-12T10:50:30","guid":{"rendered":"https:\/\/mp.moonpreneur.com\/math-corner\/?p=42398"},"modified":"2026-10-12T10:53:51","modified_gmt":"2026-10-12T10:53:51","slug":"90-percent-of-20","status":"publish","type":"post","link":"https:\/\/mp.moonpreneur.com\/math-corner\/90-percent-of-20\/","title":{"rendered":"What Is 90% of 20? Step-by-Step Math Solution"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"42398\" class=\"elementor elementor-42398\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<div class=\"elementor-inner\">\n\t\t\t\t<div class=\"elementor-section-wrap\">\n\t\t\t\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-c926792 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c926792\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-42e29d2\" data-id=\"42e29d2\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ef3c37e elementor-widget elementor-widget-text-editor\" data-id=\"ef3c37e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<p><span style=\"font-weight: 400; color: #000000;\">90% of 20 is 18. That&#8217;s the whole answer, and you can get there in under five seconds once you know one little trick. Stick around and you&#8217;ll never need a calculator for this again.<\/span><\/p><h4><span style=\"color: #33cccc;\"><b>The short answer: 90 percent of 20 equals 18<\/b><\/span><\/h4><p><span style=\"font-weight: 400; color: #000000;\">If you landed here asking &#8220;what is 90% of 20?&#8221;, here it is in plain numbers:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">90% of 20 = <\/span><b>18<\/b><\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">The leftover 10% = <\/span><b>2<\/b><\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; color: #000000;\">18 + 2 = 20, the whole you started with<\/span><\/li><\/ul><p><span style=\"font-weight: 400; color: #000000;\">So 90 percent of 20 is 18, which means you&#8217;re keeping nearly all of the 20 and shaving off just 2.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-b5de3f8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b5de3f8\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-561986b\" data-id=\"561986b\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3d1baa0 elementor-widget elementor-widget-text-editor\" data-id=\"3d1baa0\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<h2 id=\"ready-to-make-math-more-practical\" class=\"font-semibold leading-tight text-pretty mb-2 mt-4 [[data-has-inline-images]_&amp;]:clear-end text-base first:mt-0\" style=\"text-align: center;\"><span style=\"color: #008080;\">Ready to Make Math More Practical?<\/span><\/h2><p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\" style=\"text-align: center;\"><span style=\"color: #000000;\">Help your child build confidence with formulas, negative numbers, measurements, and real-world problem-solving through Moonpreneur\u2019s <strong><a href=\"https:\/\/moonpreneur.com\/innovator-program\/advanced-math\/?utm_medium=math-corner\">Advanced Math program<\/a><\/strong> for Grades 3\u20136.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-27904cd elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"27904cd\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-e0f9435\" data-id=\"e0f9435\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1ece46c elementor-widget elementor-widget-html\" data-id=\"1ece46c\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\r\n<style>\r\n.percent-guide {\r\n  font-family: Arial, sans-serif;\r\n  color: #24344d;\r\n  line-height: 1.7;\r\n  max-width: 100%;\r\n  margin: 25px auto;\r\n}\r\n.percent-guide * { box-sizing: border-box; }\r\n\r\n.percent-guide .method-card {\r\n  background: #fff;\r\n  border: 1px solid #dce6f2;\r\n  border-radius: 14px;\r\n  padding: 22px;\r\n  margin: 22px 0;\r\n  box-shadow: 0 5px 16px rgba(31, 68, 110, 0.07);\r\n}\r\n.percent-guide .method-title {\r\n  color: #205581;\r\n  font-size: 21px;\r\n  font-weight: 700;\r\n  margin: 0 0 10px;\r\n}\r\n.percent-guide .method-number {\r\n  display: inline-block;\r\n  background: #e5f1ff;\r\n  color: #205581;\r\n  border-radius: 7px;\r\n  padding: 4px 10px;\r\n  font-size: 13px;\r\n  margin-right: 7px;\r\n}\r\n.percent-guide .formula {\r\n  background: linear-gradient(100deg, #e8f3ff, #f1edff);\r\n  border-left: 5px solid #4385cf;\r\n  padding: 15px;\r\n  text-align: center;\r\n  border-radius: 8px;\r\n  font-weight: 700;\r\n  margin: 16px 0;\r\n  color: #214f7b;\r\n}\r\n.percent-guide .steps {\r\n  padding-left: 24px;\r\n  margin: 15px 0;\r\n}\r\n.percent-guide .steps li { padding: 5px 0 5px 4px; }\r\n.percent-guide .answer {\r\n  background: #e8f8ef;\r\n  border: 1px solid #b9e9ce;\r\n  color: #176b43;\r\n  border-radius: 10px;\r\n  padding: 14px;\r\n  text-align: center;\r\n  font-size: 19px;\r\n  font-weight: 700;\r\n  margin-top: 16px;\r\n}\r\n.percent-guide .shortcut {\r\n  background: #fff8e7;\r\n  border-left: 5px solid #edb746;\r\n  border-radius: 8px;\r\n  padding: 14px 16px;\r\n  margin: 15px 0;\r\n}\r\n.percent-guide .fraction {\r\n  display: flex;\r\n  flex-wrap: wrap;\r\n  gap: 12px;\r\n  margin: 18px 0;\r\n}\r\n.percent-guide .fraction-box {\r\n  flex: 1 1 130px;\r\n  text-align: center;\r\n  background: #f3f6fb;\r\n  border-radius: 10px;\r\n  padding: 16px 10px;\r\n}\r\n.percent-guide .fraction-box strong {\r\n  display: block;\r\n  color: #285f91;\r\n  font-size: 23px;\r\n  margin-bottom: 4px;\r\n}\r\n.percent-guide .table-wrap {\r\n  overflow-x: auto;\r\n  border-radius: 10px;\r\n  border: 1px solid #d8e2ed;\r\n  margin-top: 16px;\r\n}\r\n.percent-guide table {\r\n  border-collapse: collapse;\r\n  width: 100%;\r\n  min-width: 390px;\r\n  font-size: 14px;\r\n}\r\n.percent-guide th {\r\n  background: #245780;\r\n  color: #fff;\r\n  padding: 12px;\r\n  text-align: left;\r\n}\r\n.percent-guide td {\r\n  padding: 11px 12px;\r\n  border-bottom: 1px solid #e1e8f0;\r\n}\r\n.percent-guide tbody tr:nth-child(even) { background: #f2f7fc; }\r\n.percent-guide tbody tr:last-child td { border-bottom: none; }\r\n.percent-guide .highlight-row {\r\n  background: #e5f7ec !important;\r\n  font-weight: 700;\r\n  color: #176b43;\r\n}\r\n.percent-guide .tip {\r\n  background: #f0ebff;\r\n  border-radius: 10px;\r\n  padding: 15px;\r\n  margin-top: 17px;\r\n  color: #4e398b;\r\n}\r\n@media (max-width: 600px) {\r\n  .percent-guide .method-card { padding: 16px; }\r\n  .percent-guide .method-title { font-size: 19px; }\r\n}\r\n<\/style>\r\n\r\n<div class=\"percent-guide\">\r\n\r\n  <!-- METHOD 1 -->\r\n  <section class=\"method-card\">\r\n    <h3 class=\"method-title\">\r\n      <span class=\"method-number\">METHOD 1<\/span>\r\n      The Classic Percentage Formula\r\n    <\/h3>\r\n    <p>To calculate a percentage of a number, convert the percentage into a decimal and multiply.<\/p>\r\n\r\n    <div class=\"formula\">\r\n      Part = Whole \u00d7 (Percentage \u00f7 100)\r\n    <\/div>\r\n\r\n    <p><strong>Let's find 90% of 20:<\/strong><\/p>\r\n    <ol class=\"steps\">\r\n      <li>Write the percentage as a fraction: <strong>90 \u00f7 100<\/strong><\/li>\r\n      <li>Convert it into a decimal: <strong>90 \u00f7 100 = 0.90<\/strong><\/li>\r\n      <li>Multiply by 20: <strong>20 \u00d7 0.90 = 18<\/strong><\/li>\r\n    <\/ol>\r\n\r\n    <div class=\"answer\">\u2713 Final Answer: 90% of 20 = 18<\/div>\r\n  <\/section>\r\n\r\n  <!-- METHOD 2 -->\r\n  <section class=\"method-card\">\r\n    <h3 class=\"method-title\">\r\n      <span class=\"method-number\">METHOD 2<\/span>\r\n      The Subtract-10% Shortcut\r\n    <\/h3>\r\n    <p>Since 90% is just 10% less than 100%, find 10% of 20 and subtract it from 20.<\/p>\r\n\r\n    <div class=\"shortcut\">\r\n      <strong>Quick trick:<\/strong> Find 10% first. Dividing a number by 10 is easy!\r\n    <\/div>\r\n\r\n    <ol class=\"steps\">\r\n      <li>Find 10% of 20: <strong>20 \u00f7 10 = 2<\/strong><\/li>\r\n      <li>Subtract 2 from the whole number: <strong>20 \u2212 2 = 18<\/strong><\/li>\r\n    <\/ol>\r\n\r\n    <div class=\"answer\">20 \u2212 2 = 18<\/div>\r\n    <p>This shortcut works because <strong>90% = 100% \u2212 10%<\/strong>.<\/p>\r\n  <\/section>\r\n\r\n  <!-- METHOD 3 -->\r\n  <section class=\"method-card\">\r\n    <h3 class=\"method-title\">\r\n      <span class=\"method-number\">METHOD 3<\/span>\r\n      The Fraction Route\r\n    <\/h3>\r\n    <p>Percentages can also be written as fractions. The percentage 90% is equivalent to 9\/10.<\/p>\r\n\r\n    <div class=\"fraction\">\r\n      <div class=\"fraction-box\">\r\n        <strong>90\/100<\/strong>\r\n        <span>Write as a fraction<\/span>\r\n      <\/div>\r\n      <div class=\"fraction-box\">\r\n        <strong>9\/10<\/strong>\r\n        <span>Simplify the fraction<\/span>\r\n      <\/div>\r\n      <div class=\"fraction-box\">\r\n        <strong>18<\/strong>\r\n        <span>Multiply 20 \u00d7 9\/10<\/span>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <ol class=\"steps\">\r\n      <li>Divide 20 by 10: <strong>20 \u00f7 10 = 2<\/strong><\/li>\r\n      <li>Multiply the result by 9: <strong>2 \u00d7 9 = 18<\/strong><\/li>\r\n    <\/ol>\r\n\r\n    <div class=\"answer\">90% of 20 = (9\/10) \u00d7 20 = 18<\/div>\r\n  <\/section>\r\n\r\n  <!-- QUICK REFERENCE -->\r\n  <section class=\"method-card\">\r\n    <h3 class=\"method-title\">Quick Reference: Percentages of 20<\/h3>\r\n    <p>Use this handy table to compare common percentages and their values.<\/p>\r\n\r\n    <div class=\"table-wrap\">\r\n      <table>\r\n        <thead>\r\n          <tr>\r\n            <th>Percentage<\/th>\r\n            <th>Calculation<\/th>\r\n            <th>Result<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td>10% of 20<\/td>\r\n            <td>20 \u00d7 0.10<\/td>\r\n            <td>2<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>25% of 20<\/td>\r\n            <td>20 \u00d7 0.25<\/td>\r\n            <td>5<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>50% of 20<\/td>\r\n            <td>20 \u00d7 0.50<\/td>\r\n            <td>10<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>75% of 20<\/td>\r\n            <td>20 \u00d7 0.75<\/td>\r\n            <td>15<\/td>\r\n          <\/tr>\r\n          <tr class=\"highlight-row\">\r\n            <td>90% of 20<\/td>\r\n            <td>20 \u00d7 0.90<\/td>\r\n            <td>18<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>100% of 20<\/td>\r\n            <td>20 \u00d7 1.00<\/td>\r\n            <td>20<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <div class=\"tip\">\r\n      <strong>Remember:<\/strong> The word \"of\" usually means multiplication in percentage problems. Convert the percentage to a decimal, multiply, and simplify!\r\n    <\/div>\r\n  <\/section>\r\n\r\n<\/div>\r\n\r\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-0d7719a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"0d7719a\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3252fca\" data-id=\"3252fca\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2cc7fd1 elementor-widget elementor-widget-heading\" data-id=\"2cc7fd1\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Where does 90% of 20 show up in real life?\n<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-6be4331 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6be4331\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-44aad18\" data-id=\"44aad18\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2b56469 elementor-widget elementor-widget-text-editor\" data-id=\"2b56469\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<p><span style=\"font-weight: 400;\">It might look like a textbook question, but 90% of 20 pops up in everyday situations:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Shopping: <\/b><span style=\"font-weight: 400;\">A $20 item with a 10% discount costs you 90% of the price, which is $18.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>School: <\/b><span style=\"font-weight: 400;\">Scoring 18 out of 20 on a quiz is exactly 90%, a solid A in most grading systems.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Fitness: <\/b><span style=\"font-weight: 400;\">Finishing 18 of 20 planned workouts in a month means you hit 90% of your goal.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Work: <\/b><span style=\"font-weight: 400;\">If a team of 20 people has 90% attendance, 18 are in the room.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Battery life: <\/b><span style=\"font-weight: 400;\">A 20-hour battery at 90% charge gives you about 18 hours of use.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Notice the pattern? Whenever you see a 10% reduction, you&#8217;re really calculating 90 percent of the original.<\/span><\/p><p><strong>Recommended Reading: <a href=\"https:\/\/mp.moonpreneur.com\/math-corner\/41000-in-words\/\">How to Write 41000 in Words? | Forty-One Thousand<\/a><\/strong><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-d424cc8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d424cc8\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4f478e4\" data-id=\"4f478e4\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-047d250 elementor-widget elementor-widget-heading\" data-id=\"047d250\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Common mistakes to avoid\n<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-34e362d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"34e362d\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4209754\" data-id=\"4209754\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c2c7faf elementor-widget elementor-widget-text-editor\" data-id=\"c2c7faf\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"color: #000000;\"><b>Mixing up the part and the whole. <\/b><span style=\"font-weight: 400;\">90% of 20 is 18, not 20% of 90 (which also happens to be 18, a neat quirk explained below).<\/span><\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"color: #000000;\"><b>Forgetting to convert. <\/b><span style=\"font-weight: 400;\">Multiplying 20 \u00d7 90 gives 1,800. You must divide by 100 first, or use 0.90.<\/span><\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"color: #000000;\"><b>Subtracting the wrong amount. <\/b><span style=\"font-weight: 400;\">Taking 10 off instead of 10% off gives 10, not 18.<\/span><\/span><\/li><\/ul><p><strong>Recommended Reading: <a href=\"https:\/\/mp.moonpreneur.com\/math-corner\/is-0-75-the-same-as-3-4\/\">Is 0.75 the Same as 3\/4? | Decimal to Fraction<\/a><\/strong><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-30ea487 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"30ea487\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d47d578\" data-id=\"d47d578\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1fcc0bd elementor-widget elementor-widget-heading\" data-id=\"1fcc0bd\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">A fun math quirk\n<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-a1844ce elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a1844ce\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7c2353c\" data-id=\"7c2353c\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-580f481 elementor-widget elementor-widget-text-editor\" data-id=\"580f481\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<p><span style=\"font-weight: 400; color: #000000;\">Here&#8217;s something that surprises people: 90% of 20 equals 20% of 90. Both are 18. In fact, x% of y always equals y% of x, because the formula is just multiplication, and multiplication doesn&#8217;t care about order. If one version of a percentage problem feels hard, flip it. 4% of 75 sounds tricky, but 75% of 4 is just 3.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-004fbf8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"004fbf8\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3fb9a9c\" data-id=\"3fb9a9c\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b2c68cf elementor-widget elementor-widget-heading\" data-id=\"b2c68cf\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Conclusion<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-a1f121d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a1f121d\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7e4d9ce\" data-id=\"7e4d9ce\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-66ff22e elementor-widget elementor-widget-text-editor\" data-id=\"66ff22e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<p><span style=\"font-weight: 400;\">So, what is 90% of 20? It&#8217;s <\/span><b>18<\/b><span style=\"font-weight: 400;\">. Remember the three routes: multiply by 0.90, subtract 10% from the whole, or take nine-tenths. Pick whichever feels most natural, and the next time someone asks about 90% of 20, you&#8217;ll have the answer before they finish the sentence.<\/span><\/p><p><b>Bonus challenge:<\/b><span style=\"font-weight: 400;\"> What is 90% of 200? What about 90% of 2,000? (Answers: 180 and 1,800. Just add zeros!)<\/span><\/p><p>You can opt for our <a href=\"https:\/\/moonpreneur.com\/innovator-program\/advanced-math\/\">Advanced Math<\/a>\u00a0or Vedic Math+Mental Math courses. Our\u00a0<a href=\"https:\/\/mp.moonpreneur.com\/math-quiz-for-kids\/\">Math Quiz<\/a> for grades 3rd, 4th, 5th, and 6th helps in further exciting and engaging in mathematics with hands-on lessons.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>90% of 20 is 18. That&#8217;s the whole answer, and you can get there in under five seconds once you know one little trick. Stick around and you&#8217;ll never need a calculator for this again. The short answer: 90 percent of 20 equals 18 If you landed here asking &#8220;what is 90% of 20?&#8221;, here [&hellip;]<\/p>\n","protected":false},"author":116,"featured_media":42396,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false},"categories":[969],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/mp.moonpreneur.com\/math-corner\/wp-json\/wp\/v2\/posts\/42398"}],"collection":[{"href":"https:\/\/mp.moonpreneur.com\/math-corner\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mp.moonpreneur.com\/math-corner\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mp.moonpreneur.com\/math-corner\/wp-json\/wp\/v2\/users\/116"}],"replies":[{"embeddable":true,"href":"https:\/\/mp.moonpreneur.com\/math-corner\/wp-json\/wp\/v2\/comments?post=42398"}],"version-history":[{"count":4,"href":"https:\/\/mp.moonpreneur.com\/math-corner\/wp-json\/wp\/v2\/posts\/42398\/revisions"}],"predecessor-version":[{"id":42402,"href":"https:\/\/mp.moonpreneur.com\/math-corner\/wp-json\/wp\/v2\/posts\/42398\/revisions\/42402"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mp.moonpreneur.com\/math-corner\/wp-json\/wp\/v2\/media\/42396"}],"wp:attachment":[{"href":"https:\/\/mp.moonpreneur.com\/math-corner\/wp-json\/wp\/v2\/media?parent=42398"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mp.moonpreneur.com\/math-corner\/wp-json\/wp\/v2\/categories?post=42398"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mp.moonpreneur.com\/math-corner\/wp-json\/wp\/v2\/tags?post=42398"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}