1. Subtraction 63 – 49 = 64 – 50 True or false? Explain why it works
Could this be a successful mental method?
323 – 149 = 324 – 150 = 374 – 200
What representations might you use to support
children’s conceptual understanding of the
strategy?
Acknowledgement: Maths Specialist Teacher Programme- University of Northampton
Just to get you thinking about the nature of subtraction … 1

2. Acknowledgement: Leicestershire School Improvement Service1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Acknowledgement: Leicestershire School Improvement Service

3. Acknowledgement: Leicestershire School Improvement Service
- 323
- 149
- 324
- 150
- 374
- 200
Acknowledgement: Leicestershire School Improvement Service