Add three addends efficiently using a range of strategies
I can choose the best strategy to add three small numbers together.
Add three addends efficiently using a range of strategies
I can choose the best strategy to add three small numbers together.
Lesson details
Key learning points
- Using commutativity allows us to simplify a problem with three addends.
- Using known facts allows us to add three addends efficiently.
- Rearranging the addends to identify the pairs that total 10 allows us to add efficiently.
Common misconception
Children rely on one strategy for adding to find a sum and do not consider the values.
Discuss when it is most efficient to use doubles, near doubles, number pairs to 10. Model efficient approaches.
Keywords
Addend - A number added to another.
Commutative - Addition is commutative. This means the order of the addends can be changed without changing the calculation or sum.
Equation - An equation is used to show that one number or calculation is equal to another.
Sum - The total when numbers are added together.
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).
Video
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Starter quiz
6 Questions
13
12
14
15
Exit quiz
6 Questions
pairs that total 10
near doubles
doubles
11
14
13
12
