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First Year maths · E.3 · Percent change and error

Percent change: increase or decrease

Subtract to find the change, then divide by the starting number and multiply by 100.

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  1. A value changes from 24 to 12. Is that a percent increase or decrease, and by how much? Write the percent only.

    Answer: 50

  2. A value changes from 95 to 76. Is that a percent increase or decrease, and by how much? Write the percent only.

    Answer: 20

  3. A value changes from 124 to 186. Is that a percent increase or decrease, and by how much? Write the percent only.

    Answer: 50

Tip: Subtract to find the change, then divide by the starting number and multiply by 100.

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