Percent change in a shrinking number

Teaching Transcript

🎙️

What is the percent change if 80 shrinks to 64?

🎙️

First we need to find the absolute change by subtracting. It's a change of 16

🎙️

Now, what percent of 80 is 16

🎙️

We know that 8 is 10% of 80. 16 is twice that, so 16 is 20% of 80

🎙️

So shrinking from 80 to 64 is a decrease of 20%

This math skill teaches how to calculate percent change when a number decreases. It involves finding the absolute difference between the initial and new numbers, then determining what percentage this difference represents of the original number.

Skill Practice

Percent change in a shrinking number

Test your understanding of percent change in a shrinking number by practicing it! Work through the below exercises to use it in practice.

Percent reduction of a number (10% multiples)

Percent reduction of a number (10% multiples) - Concept Intro

Percent reduction of a number (10%) - Concept Intro

Percent change in a shrinking number (10% multiples)

Percent change in a shrinking number (10% multiples) - Concept Intro

Percent change in a shrinking number (10%) - Concept Intro