What is a estimate?

To estimate is to find an answer that is close enough, usually by rounding the numbers first. Estimating helps you check whether an exact answer is reasonable and is quick to do in your head.

Examples

• 298 + 51 is about 300 + 50 = 350.
• Estimate 19 × 21 as 20 × 20 = 400.
• £4.95 is about £5.

Quick facts

• Round the numbers to easy values first, then work with those.
• A good estimate catches big mistakes , if your exact answer is far from it, check your working.