Add and subtract 10 to and from a 2-digit number.
I can add and subtract 10 to and from a two-digit number.
Add and subtract 10 to and from a 2-digit number.
I can add and subtract 10 to and from a two-digit number.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- When adding or subtracting 10, the ones digits does not change.
- When adding 10, the tens digit increases by one; when subtracting 10, the tens digit decreases by one.
- When numbers have the same ones digit and the tens digit has a difference of one, they will have a difference of 10
- Understanding the patterns when we add and subtract 10 can help us solve equations efficiently.
Keywords
Efficiently - Not wasting time or effort. An efficient strategy is one we can carry out easily.
Common misconception
Children may focus on the ones digit rather than the tens digits. They may calculate inefficiently by counting on/back in ones rather than using the pattern in the tens digits.
Use Base 10 equipment alongside one hundred squares to support with understanding the structure of adding or subtracting ten and difference. Encourage children to notice what changes and what stays the same.
Licence
This content is © Oak National Academy Limited (2024), licensed on
Lesson video
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Starter quiz
6 Questions
60
90
70
20
38
51
79
92
23
32
46
61
Exit quiz
6 Questions
44
67
71
98
25
39
52
87
45
54
71
27