Estimation to check answers to calculations

“Before your child works out a large multiplication or division, can they estimate what the answer should be roughly — and then check whether their final answer is in the right ballpark?”

0 / 3 mastered

• ⬜Estimate 487 × 23 by rounding to 500 × 20 and use this to check a calculated answer
• ⬜Determine whether an exact answer or an estimate is more appropriate in a given context
• ⬜Spot an unreasonable answer by comparing with a quick mental estimate