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A percentage change is a way to express a change between the old value and the new one (which is the extent to which something gains or loses value.)

Published byCornelia Ward Modified over 9 years ago

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Presentation on theme: "A percentage change is a way to express a change between the old value and the new one (which is the extent to which something gains or loses value.)"— Presentation transcript:

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2 A percentage change is a way to express a change between the old value and the new one (which is the extent to which something gains or loses value.) Percent changes are useful to help people understand changes in a value over time.

3 PERCENT INCREASE WHEN THE PRICE OF AN ITEM GOES UP PERCENT DECREASE WHEN THE PRICE OF AN ITEM GOES DOWN

4 Amount of change (subtraction) % (percentage of increase or decrease) Original amount (the original price of item) 100 (ALWAYS)

5 EXAMPLE Andrew works in a supermarket for $10.00 per hour. If her pay is increased to $12.00. Is this a percent increase or decrease?

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7 WHAT IS HER PERCENT INCREASE IN PAY?

8 EXAMPLE The staff at a company went from 40 to 30 employees. Is this a percent increase or decrease?

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10 WHAT IS THE PERCENT DECREASE IN STAFF?

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