This math topic focuses on calculating the percent change when a number grows by a certain amount, specifically using multiples of 10%. It addresses the concept of determining how much a given number has increased in percent terms. Each problem presents the initial and increased amounts, and students are tasked with figuring out the percentage increase from the original number. Options are provided for answers, reflecting common mistakes or misunderstandings that might occur during calculation. This topic is an introduction level part of a broader unit on percentages.
Work on practice problems directly here, or download the printable pdf worksheet to practice offline.
Practice:
Percent change in a growing number (10% multiples) - Concept Intro
Complete these online problems with 80% or 4 correct answers in a row. Results are immediate.
What percent did the number change by?
10% of 90 is 9
What is the % change if 90 grows to 117
Percent change in a growing number (10% multiples) - Concept Intro Worksheet
| Math worksheet on 'Percent change in a growing number (10% multiples) - Concept Intro (Level 1)'. Part of a broader unit on 'Percentages - Intro' Learn online: app.mobius.academy/math/units/percentages_intro/ |
| 10% of 20 is 2 What is the % change if 20 grows to 24 |
| What percent did the number change by? |
| 20% |
| 17% |
| 40% |
| 50% |
| 38% |
| 39% |
| 10% of 60 is 6 What is the % change if 60 grows to 78 |
| What percent did the number change by? |
| 45% |
| 70% |
| 54% |
| 50% |
| 60% |
| 30% |
| 10% of 90 is 9 What is the % change if 90 grows to 108 |
| What percent did the number change by? |
| 30% |
| 32% |
| 20% |
| 50% |
| 19% |
| 25% |
| 10% of 100 is 10 What is the % change if 100 grows to 120 |
| What percent did the number change by? |
| 19% |
| 20% |
| -10% |
| 40% |
| 50% |
| 10% |
| 10% of 80 is 8 What is the % change if 80 grows to 104 |
| What percent did the number change by? |
| 81% |
| 0% |
| 20% |
| 30% |
| -0% |
| 70% |
| 10% of 20 is 2 What is the % change if 20 grows to 26 |
| What percent did the number change by? |
| 84% |
| 50% |
| 40% |
| 20% |
| 10% |
| 30% |
| 10% of 100 is 10 What is the % change if 100 grows to 130 |
| What percent did the number change by? |
| -0% |
| 30% |
| 63% |
| 78% |
| 36% |
| 66% |