Step 5 Objective
Check a result by considering whether it is of the right order of magnitude and by working the problem backwards.
- Examples of what pupils should
know and be able to do - Probing questions
- What if pupils find
this a barrier?
What if pupils find this a barrier?
It can be helpful to give pupils some worked examples to mark and to identify the mistakes.
Encourage pupils to approximate first before working out answers.
Refer to Teaching Mental Calculation Strategies to L5 pp. 55-60. - Acrobat pdf document (50Kb)