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You learn to make a quick, sensible guess before finding the exact answer. This helps you spot whether your working is reasonable and check mistakes in addition, subtraction, multiplication and division.
You should already know place value and basic rounding. You also need to be comfortable with the four operations and simple times tables.
Not confident yet? Work through Quick Calculation Tricks first.
One question from this skill's own question bank, shown with its full working.
Estimate 38 × 21 by rounding.
Working: 38 ≈ 40 and 21 ≈ 20; 40 × 20 = 800.
In Upper Primary, this usually sits within number work and mental mathematics. It supports school-based assessment by helping you show sensible working, and it builds the checking habits 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.