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