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Percent of Change: Chapter 7.5 Goals: To find percent of increase and decrease. To solve problems involving percent of change.

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Vocabulary Percent of change: an increase or decrease expressed at a percent. Percent of increase: the new number is greater than the original number. Percent of decrease: the new number is less than the original number.

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Percent of Change Formula difference in the amounts = % change original amount 100

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Identify if it’s an increase or decrease! 1.original: 32 new: 40 2.original: 20 new: 4 IncreaseDecrease

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Identify if it’s an increase or decrease! 1.original: 450 new: 504 2.original: 225 new: 243 Increase

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Identify if it’s an increase or decrease! 1.original: 36 new: 27 2.original: 85 new: 119 DecreaseIncrease

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Identify if it’s an increase or decrease! 1.original: 32 new: 40 2.original: 20 new: 4 = 100 x Difference 32 = 100 x Difference 20

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Identify if it’s an increase or decrease! 1.original: 450 new: 504 2.original: 225 new: 243 = 100 x Difference 450 = 100 x Difference 225

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Identify if it’s an increase or decrease! 1.original: 36 new: 27 2.original: 85 new: 119 = 100 x Difference 36 = 100 x Difference 85

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Identify if it’s an increase or decrease! 1.original: 32 new: 40 2.original: 20 new: 4 = 100 x Difference 32 8 800=32x 32 X = 25% Increase = 100 x Difference 20 16 1600=20x 20 X = 80% Decrease!

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Identify if it’s an increase or decrease! 1.original: 450 new: 504 2.original: 225 new: 243 = 100 x Difference 450 54 5400=450x 450 = 100 x Difference 225 18 1800=225x 225

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Identify if it’s an increase or decrease! 1.original: 36 new: 27 2.original: 85 new: 119 = 100 x Difference 36 9 900=36x 36 = 100 x Difference 85 34 3400=85x 85

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On Your Own 3.original: 72 new: 36 4.original: 45 new: 50 CHALLENGE: In 1987, the United States had 2 million active-duty military personnel. By 2000, there were only 1.4 million active-duty military personnel. What was the percent of decrease? 50% Decrease11.1% Increase 30% Decrease

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