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Grade 7 maths · E.1 · Percent change and error

Percent increase

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

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  1. A value changes from 65 to 78. Is that a percent increase or decrease, and by how much? Write the percent only.

    Answer: 20

  2. A value changes from 110 to 121. Is that a percent increase or decrease, and by how much? Write the percent only.

    Answer: 10

  3. A value changes from 80 to 96. Is that a percent increase or decrease, and by how much? Write the percent only.

    Answer: 20

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

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