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This activity is about finding percentage change.
Example 1
A metal bar increases its length from 2 m to 2.01 m after heating.
Find the percentage increase in its length.
Actual increase = 2.01 - 2 = 0.01 m
Percentage increase = (actual increase ÷ original length) x 100 = (0.01 ÷ 2) x 100 = 0.5%
Example 2
A woman reduced her weight from 80 kg to 63 kg after dieting.
Find the percentage decrease in her weight.
Actual decrease = 80 - 63 = 17 kg.
Percentage decrease = (actual decrease ÷ original weight) x 100 = (17 ÷ 80) x 100 = 21.25
Just remember the formula for percentage change = (actual change ÷ original) x 100
Let's try some questions now.
