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Percent of a quantity

Find a percentage of a whole-number amount.

Practice + answer key · 2 pages

Worksheet settings12 questions · 2 columns · A4
Whole quantity

Choose the whole-number quantities to use. Percentages come from 10, 20, 25, 50, and 75.

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mathsprig-1
Content ID
9a85e22e
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1 page
Percent of a quantityPercent of a quantity. Practice. Find 25% of 82. Find 20% of 24. Find 10% of 99. Find 75% of 43. Find 50% of 29. Find 25% of 79. Find 75% of 43. Find 10% of 83. Find 20% of 60. Find 50% of 61. Find 75% of 88. Find 20% of 61.Name __________________________Date _______________Percent of a quantityFind each percentage of the given quantity.Worked exampleFind 25% of 80. → 2025% = 25/100 = 1/4.1.Find 25% of 82.2.Find 20% of 24.3.Find 10% of 99.4.Find 75% of 43.5.Find 50% of 29.6.Find 25% of 79.7.Find 75% of 43.8.Find 10% of 83.9.Find 20% of 60.10.Find 50% of 61.11.Find 75% of 88.12.Find 20% of 61.MathSprig · mathsprig.site · support@mathsprig.sitePage 1 of 1mathsprig-1 · mathsprig-v1 · 9a85e22e
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Practice + answer key · 2 pages

Ratios & percentages

What you’ll practice

Calculate a stated percentage of a quantity without rounding.

Start by identifying the whole. Then use a fraction or decimal to find the part: 25% is one quarter, so 25% of 80 is 80 ÷ 4.

How this skill works

Write p% as p/100. Multiply the whole by p and divide by 100.

Useful checks include 50% being one half and 25% being one quarter. An answer for a positive percentage below 100% must be smaller than the whole.

Worked example

Find 25% of 80.
  1. 25% = 25/100 = 1/4.
  2. 80 × 1/4 = 20.

Answer: 20

Teaching notes

  • Keep exact decimal digits; these questions do not require rounding.
  • Identify the whole before multiplying.
Practice questions
  1. Find 25% of 82.
  2. Find 20% of 24.
  3. Find 10% of 99.
  4. Find 75% of 43.
  5. Find 50% of 29.
  6. Find 25% of 79.
  7. Find 75% of 43.
  8. Find 10% of 83.
  9. Find 20% of 60.
  10. Find 50% of 61.
  11. Find 75% of 88.
  12. Find 20% of 61.
Answers and steps
  1. 20.5
    1. 25/100 × 82 = 20.5.
  2. 4.8
    1. 20/100 × 24 = 4.8.
  3. 9.9
    1. 10/100 × 99 = 9.9.
  4. 32.25
    1. 75/100 × 43 = 32.25.
  5. 14.5
    1. 50/100 × 29 = 14.5.
  6. 19.75
    1. 25/100 × 79 = 19.75.
  7. 32.25
    1. 75/100 × 43 = 32.25.
  8. 8.3
    1. 10/100 × 83 = 8.3.
  9. 12
    1. 20/100 × 60 = 12.
  10. 30.5
    1. 50/100 × 61 = 30.5.
  11. 66
    1. 75/100 × 88 = 66.
  12. 12.2
    1. 20/100 × 61 = 12.2.