iGCSE Mathematics (0580) :E1.9 Make estimates of numbers, quantities and lengths. iGCSE Style Questions Paper 2

Question

By writing each number correct to 1 significant figure, find an estimate for the value of \(\frac{2.8\times 82.6}{27.8-13.9}\)

▶️ Answer/Explanation

Answer: 12

Round numbers: 2.8→3, 82.6→80, 27.8→30, 13.9→10. Calculation: (3×80)/(30-10) = 240/20 = 12.

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