Understanding Percentage Decrease

In this video, Mr. J explains how to calculate the percent of change, focusing on percentage decrease. He provides a step-by-step guide to finding the amount of change, dividing by the original number, and converting the result to a percentage. Two examples are demonstrated: a decrease from 16 to 9 and from 40 to 25. The video concludes with a summary of the methods used to express percentage decrease.

What is the focus of the video tutorial?

• Solving equations

• Percentage increase

• Percentage decrease

• Calculating averages

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CCSS.6.RP.A.3C

What is the first step in calculating percent change?

• Multiply by 100

• Subtract the old number from the new number

• Divide by the new number

• Add the old and new numbers

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CCSS.6.RP.A.3C

Why is it important to divide by the old number when calculating percent change?

• To ensure the result is a whole number

• To compare the change relative to the original value

• To make the calculation easier

• To avoid negative numbers

What is the final step in converting a decimal to a percentage?

• Subtract 100

• Add 100

• Multiply by 100

• Divide by 100

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CCSS.7.NS.A.1C

In Example 1, what is the amount of change when going from 16 to 9?

• 16

• -7

• 7

• 9

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CCSS.6.RP.A.3C

What is the percentage decrease from 16 to 9?

• 56.25%

• 25%

• 37.5%

• 43.75%

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CCSS.2.OA.A.1

In Example 2, what is the new number?

• 10

• 25

• 15

• 40

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CCSS.6.RP.A.3C

What is the percentage decrease from 40 to 25?

• 37.5%

• 50%

• 25%

• 62.5%

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CCSS.6.RP.A.3C

How can a percentage decrease be expressed?

• As a positive number

• Only as a decimal

• As a negative number or with the word 'decrease'

• Only as a fraction

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CCSS.6.RP.A.3C

What does a negative percentage indicate in the context of percent change?

• A decrease

• No change

• An error in calculation

• An increase

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CCSS.6.RP.A.3C