Step 3 Objective

Extend efficient written methods to column addition/subtraction of two integers less than 10000.

Examples of what pupils should know and be able to do

Probing questions

Which of these calculations are correct/incorrect?

What tips would you give to someone to help with column addition/subtraction?

If you are given a sum does it matter if you add the numbers in a different order? What about subtraction?

What if pupils find this a barrier?

Refer back to Step 2.

For guidance on addition and subtraction refer to the document 'The National Numeracy Strategy: Teaching written calculations – guidance for teachers at Key Stages 1 and 2' (QCA/99/486) pp. 33-34.