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Mathematics · Grades 6–9

Find the original whole

Divide by the percentage as a decimal, not by the whole-number percent.

Make a worksheet

The key idea

Divide by the percentage as a decimal, not by the whole-number percent.

whole = part ÷ (p/100)

Worked examples

40% of a number is 392. What is the number?

392 ÷ 0.4 = 980

980

20% of a number is 40. What is the number?

40 ÷ 0.2 = 200

200

Try it yourself

  1. 25% of a number is 265. What is the number?

  2. 20% of a number is 8. What is the number?

Check your understanding

Answers and marking notes
  1. 1060

    265 ÷ 0.25 = 1060

  2. 40

    8 ÷ 0.2 = 40

Further reading and review references

These are reference links, not copied exercises, institutional endorsement or proof of independent review.

Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.