This math topic focuses on calculating the percent change in shrinking numbers, specifically in multiples of 10%. It includes exercises where students find the percentage decrease when a number decreases from its original value by given percentages. Each problem presents an initial calculation of what 10% of various numbers such as 80, 20, 60, 40, 10, 100 is, followed by a question asking what the percentage change is when that number reduces to a lower value. Answer choices are provided in multiple-choice format to reinforce understanding of percentage decrease calculations.
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What percent did the number change by?
10% of 30 is 3
What is the % change if 30 shrinks to 24