Mathematics for IGCSE & O level - Estimation (Section 2 - No. 33)

What is a useful strategy when estimating the answer to a division problem?

Round only the dividend to one significant figure and divide exactly.

Round both the dividend and divisor to one significant figure, then divide.

Use a calculator to get the exact answer.

Round only the divisor to one significant figure and divide exactly.

Round both the dividend and the divisor to one significant figure and divide.