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You learn to make sums and multiplication faster in your head by changing numbers into friendlier ones. This helps you work neatly in tests and saves time when checking answers.
You should already know addition and multiplication facts up to at least 10 times tables. You should also be comfortable with place value and simple rounding to the nearest ten.
One question from this skill's own question bank, shown with its full working.
Use rounding to find 99 + 47 quickly.
Working: Think 100 + 47 = 147, then subtract 1 → 146.
This kind of work usually appears in Upper Primary mathematics as part of mental computation and number sense. It supports school-based assessment and builds the quick thinking needed for later BECE preparation.
Curriculum notes are a general guide to where this work normally sits. Always check the syllabus your school or examination body is currently using.
Other Mental Maths & Speed Strategies skills in Maths, at the same point in the course.
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8 questions with a worked answer after every attempt, and a SmartScore that tracks how close you are to mastery.