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?
Probing questions
Roughly, what answer do you expect to get? How did you come to that estimate? Do you think your estimate is higher or lower that the real answer? Explain why.
How would you use inverse operations to check that a calculation is correct?