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Check your answer poster

How to check your answer: estimate first

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A4 portrait. It is drawn in vector form, so it also prints sharply scaled up to A3.

The poster

Classroom poster: how to check your answer, estimate first. Round each number to 1 significant figure and work it out in your head. 48.7 × 3.1 ≈ 50 × 3 = 150. Is your answer close to 150?
How to check your answer: estimate first. IB Math Revision, free for classroom use.

The maths

Round each number to 1 significant figure and work it out in your head. For example: 48.7 × 3.1 ≈ 50 × 3 = 150. Is your answer close to 150?

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