Mathematics for IGCSE & O level - Estimation (Section 1 - No. 10)
When estimating the sum of 12.7, 3.14, and 5.9, what would be a sensible first step?
Use a calculator to find the exact sum.
Round each number to the nearest tenth.
Round each number to the nearest whole number.
Round only the first number to the nearest tenth
解释
Rounding to the nearest whole number simplifies the addition process.