In worksheet, children practise rounding in order to estimate
the answers to both additions and subtractions. They also review
mental strategies for estimating answers.
Children should be familiar with the word 鈥渁pproximate鈥�, and 鈥渆stimate鈥� and
the degree of accuracy to which to round is a useful point for discussion. Generally, rounding to the nearest 100 for 3-digit numbers,
the nearest 1,000 for 4-digit numbers and so on is appropriate.

Extra reasoning sheet attached.
Answer sheet attached.