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Check your answer poster

How to check your answer: work backwards

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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, work backwards. Undo each step and see if you get back to the start. Multiply to check a division. Expand to check a factorisation. Differentiate to check an integral.
How to check your answer: work backwards. IB Math Revision, free for classroom use.

The maths

Undo each step and see if you get back to the start. For example: Multiply to check a division. Expand to check a factorisation. Differentiate to check an integral.

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