Mathematics for IGCSE & O level - Estimation (Section 2 - No. 11)

If you are estimating the volume of a box and the dimensions are 5.7 cm, 8.2 cm, and 3.1 cm, what would be the most appropriate first step?

Calculate the exact volume.

Round each dimension to the nearest whole number.

Round each dimension to 1 significant figure.

Use a calculator to find the answer.

Rounding to 1 significant figure simplifies the calculation.