New
New
Year 2
Add and subtract 10 to and from a 2-digit number.
I can add and subtract 10 to and from a two-digit number.
New
New
Year 2
Add and subtract 10 to and from a 2-digit number.
I can add and subtract 10 to and from a two-digit number.
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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.
Encourage children to search for and use patterns in the digits and to create their own patterns. Orally rehearse stem sentences within this lesson to help children articulate their thinking in full sentences. You may wish to select parts of Task A and B to complete, rather than completing all.
Teacher tip
Licence
This content is © Oak National Academy Limited (2024), licensed on
Open Government Licence version 3.0
except where otherwise stated. See Oak's terms & conditions (Collection 2).Lesson video
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Starter quiz
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6 Questions
Q1.
Match to complete the sentence.
60
90
70
20
Q2.
True or false. The numbers in this sequence are increasing by 10 each time.
True
Q3.
Match so that the second number is 10 more than the first.
38
51
79
92
Q4.
Match so that the second number is 10 less than the first.
23
32
46
61
Q5.
What is the missing number below?
Q6.
Look at the number in the place value chart. 10 less than this number is
Exit quiz
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6 Questions
Q1.
Adding 10 is the same as finding 10 more. Match the equations to their sums.
44
67
71
98
Q2.
Subtracting 10 is the same as finding 10 less. Match the equations to their difference.
25
39
52
87
Q3.
10 + 72 =
Q4.
89 − 10 =
Q5.
Match two numbers that have a difference of 10
45
54
71
27
Q6.
54 and ___ have a difference of 10
55
45