Year 3 - Maths
Add three addends efficiently using a range of strategies
Review strategies for adding and subtracting across 10
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will be reviewing and securing previous knowledge of adding 3 addends, understanding they can be added in any order and combined in different ways to bridge through 10
Lesson Summary
You will learn to choose the best strategy to add three small numbers together.
Key Notes
- 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.
Vocabulary To Learn
- 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.
Common Mistakes To Avoid
- Children rely on one strategy for adding to find a sum and do not consider the values.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Using commutativity allows us to simplify a problem with three addends. Using known facts allows us to add three addends efficiently.
2. Use this key word in a maths sentence and explain it clearly. 'addend'
A number added to another. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Children rely on one strategy for adding to find a sum and do not consider the values. Correction: Discuss when it is most efficient to use doubles, near doubles, number pairs to 10. Model efficient approaches.
More Lessons In This Unit
- Add 3 numbers together in different contexts Study Guide
- Add 3 numbers together using doubles and near doubles Study Guide
- Add three addends by finding pairs that total 10 Study Guide
- Addition by bridging through 10 Study Guide
- Numbers can be added in any order Study Guide
- Solving problems involving addition and subtraction Study Guide
- Subtracting numbers that bridge through 10 Study Guide
- Subtracting small numbers Study Guide
- Subtracting to and from 10 Study Guide
Browse all guides in the Year 3 Maths guide library.