Free Maths Calculator

Estimation Calculator

Estimate a calculation the exam way: round every number to one significant figure, then work with the friendly versions. The rounding of each number is shown separately before the estimate, and the answer keeps its wavy equals sign, because an estimate never pretends to be exact.

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Method, Step by Step

    Worked Example

    Estimate 347 × 8.2.

    1. Round each number to 1 significant figure: 347 → 300 and 8.2 → 8
    2. Multiply the friendly numbers:300 × 8 = 2,400

    Answer: ≈ 2,400

    Try These Yourself

    Estimate 612 ÷ 2.9.Show answerHide answer

    Answer: ≈ 200

    600 ÷ 3 = 200.

    Estimate 48.7 + 31.2.Show answerHide answer

    Answer: ≈ 80

    50 + 30 = 80.

    Estimate 92 × 41.Show answerHide answer

    Answer: ≈ 3,600

    90 × 40 = 3,600.