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# Copyright © Mathematics Mastery 2017
Parental Guidance
In this unit, pupils will be adding and subtracting using mental methods and using the written column method. This week focuses on using the written column method of addition and subtraction.
Pupils will have been introduced to column addition and subtraction, using the written method alongside place value counters. These counters support pupils to understand how and why the column methods work. As well as using the counters themselves, pupils will have also drawn representations of them, as shown below.
Column addition
What pupils will write: What pupils will draw: What pupils will say:
Column subtraction
What pupils will write: What pupils will draw: What pupils will say:
Unit 2: Addition and subtraction (Week 2 of 3)
2
6
3
5
+
3
5
4
1
6
1
7
6
1
5 ones plus 1 one is equal to 6 ones
3 tens plus 4 tens is equal to 7 tens.
6 hundreds plus 5 hundreds is equal to 11 hundreds. I need to regroup 10 hundreds for 1 thousand. There is 1 hundred counter left .
2 thousands plus 3 thousands plus 1 thousand is equal to 6 thousands.
Thousands
Hundreds
Tens
Ones
6
1
7
6
1000
1000
1000
1000
1000
100
100
100
100
100
100
100
100
100
100
100
10
10
10
10
10
10
10
1
1
1
1
1
1
1000
4
1
4
2
-
1
7
2
0
2
4
2
2
No ones are subtracted, so there are 2 ones.
4 tens subtract 2 tens is equal to 2 tens
I can’t subtract 7 hundred counters from 1 hundred counter. I regroup 1 thousand for 10 hundreds. 11 hundreds subtract 7 hundreds is equal to 4 hundreds.
3 thousands subtract 1 thousand is equal to 2 thousands.
Thousands
Hundreds
Tens
Ones
2
4
2
2
1000
1000
100
10
10
10
1
1
1000
1000
10
100
100
100
100
100
100
100
100
100
100
1
3