New
New
Year 2
Add three addends efficiently by finding two addends that total 10
I can use my knowledge of number pairs to 10 to add three addends efficiently.
New
New
Year 2
Add three addends efficiently by finding two addends that total 10
I can use my knowledge of number pairs to 10 to add three addends efficiently.
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Lesson details
Key learning points
- The order of the addends can change and the sum stays the same.
- When adding three addends, it is efficient to first find two addends that sum to 10
- ___ add ___ is equal to 10 Then, 10 add ___ is equal to ___
Keywords
Addends - Any of the numbers that are added together.
Number pairs - Two numbers that sum to make 10
Efficient - Not wasting time or effort. An efficient strategy is one we can carry out easily.
Common misconception
If children record incorrectly, they could re-add an addend that has already been used to make a pair to 10
Carefully model how to record thinking, rewriting the new equation inclusive of 10 underneath.
When adding three addends, always encourage children to see if they can find two addends that sum to 10 before adding the third addend. Outside of the lesson, build speed in recalling the pairs to 10 through quizzing and games.
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 the number pairs to 10
9
7
5
6
8
Q2.
'Make 10' by adding the third addend.
+ 6
+ 4
+ 2
+ 5
Q3.
Match each double fact to the correct answer.
10
12
18
14
16
Q4.
Find the sum of the three addends and compare this to 10
greater than 10
less than 10
equal to 10
Q5.
Which step has been taken in solving this equation?
Using a known double fact.
Finding the total of the first two addends.
Q6.
Solve this equation using an efficient strategy.
1 + 4 + 5 =
Exit quiz
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6 Questions
Q1.
Which number pairs are not pairs to 10?
9 and 1
4 and 6
3 and 7
Q2.
Which expressions include two addends that are a number pair to 10?
4 + 3 + 2
Q3.
Which are correct?
4 + 4 + 1 > 10
5 + 3 + 2 < 10
Q4.
Which two addends are a number pair to 10?
6 and 8
8 and 4
Q5.
Look at this equation and complete the stem sentence.
5 + 5 is equal to 10, then 10 + 4 is equal to
Q6.
Look at the part-part-whole model.
Say the stem sentence aloud to find the sum
___ add ___ is equal to 10, then 10 add ___ is equal to
