Step 1 Objective
Know by heart all addition and subtraction facts for each number to 20.
- 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?
Ask pupils to find all the additions and subtractions with a given answer - up to about 20.
Encourage pupils to be systematic and to look for patterns.
Targeting Level 4 Lesson N1.8 Starter Activity. - Acrobat pdf document (60Kb)
Twenty Cards ITP - Zip file (463Kb) can be used to practise number pairs to 20.
Number facts ITP - Zip file (456Kb) can be used to help develop the idea of subtraction.
Difference ITP - Zip file (457Kb) can be used to help make links with number line work.
Different visual images may need to be used to help develop the links between addition and subtraction.
Refer to Teaching mental calculation strategies to L5 page pp. 15-30- Acrobat pdf document (554Kb)