Autumn
1
Using unstructured number line— bridging 10’s
2 digit - 2 digit
Eg 63 - 38
Spring
Summer
1
When solving the calculation 89 – 57, children need to
understand that the number being subtracted (57)
does not appear as an amount on its own, but rather as
part of the larger amount. Therefore, when using Base
10 materials, children would need to count out only the
89.
1
Introduce formal column method up to 3 digit number.
This will not involve carrying.
Eg 368 - 42
368
- 42
326
Introduce formal written method using 2 digit - 2 digit
calculations (including decomposition).
Eg 42 - 27
42
- 27
15
3
89
- 57
2
Using unstructured number line to subtract up to
3 digit. Partition the steps into hundreds, tens and
units.
=
80
9
50
7
30
2 = 32
1
2 Children to use the partition method with 2 digits to involve 2
exchange.
Introduce formal column method up to 3 digit number.
This will not involve carrying.
Eg 368 - 42
368
- 42
326
Continue to work on formal written method using 2 digit - 2 digit calculations (including decomposition).
Eg 42 - 27
42
- 27
15
3
1