Free Maths Calculator

Fraction of an Amount Calculator

Find a fraction of any amount by dividing by the bottom and multiplying by the top, or run it backwards when you know the part and need the whole. Both directions show the value of one part on its own line, which is the bar model thinking 11+ and SATs mark schemes reward.

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Answer

Method, Step by Step

    Worked Example

    Find 35 of 45.

    1. Divide by the bottom:45 ÷ 5 = 9, so one fifth is 9
    2. Multiply by the top:9 × 3 = 27

    Answer: 27

    Try These Yourself

    Find 23 of 36.Show answerHide answer

    Answer: 24

    36 ÷ 3 = 12, then 12 × 2.

    25 of a number is 30. What is the number?Show answerHide answer

    Answer: 75

    One fifth is 30 ÷ 2 = 15, and five fifths is 75.

    Find 710 of 90.Show answerHide answer

    Answer: 63

    90 ÷ 10 = 9, then 9 × 7.