Year 3 - Maths
Understand why the order of addition and subtraction steps can be chosen
Understand additive relationships and apply them to rearrange equations
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Study Guides
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 accurately and efficiently solve multi-step addition and subtraction problems. They will understand and explain how both addition and subtraction equations can be used to describe the same additive relationship.
Lesson Summary
You will learn to understand why the order of addition and subtraction steps can be chosen.
Key Notes
- Addition and subtraction can be done in any order
- If you do the addition and subtraction in a different order, the answer will be the same
- Problems can have equal answers even when different numbers are added and subtracted.
Vocabulary To Learn
- Reorder: Reorder means arrange something in a different way.
Common Mistakes To Avoid
- Pupils may reorder the numbers but forget to reorder the operations too.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Addition and subtraction can be done in any order. If you do the addition and subtraction in a different order, the answer will be the same.
2. Use this key word in a maths sentence and explain it clearly. 'Reorder'
Reorder means arrange something in a different way. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils may reorder the numbers but forget to reorder the operations too. Correction: Model the problems using tens frames and number lines, ensuring that pupils understand that both the numbers and operations need to be reordered.
More Lessons In This Unit
- Develop understanding of the relationship between addition and subtraction Study Guide
- Identify knowns and unknowns in addition equations Study Guide
- Identify knowns and unknowns in subtraction equations Study Guide
- Solve multi-step addition and subtraction problems efficiently Study Guide
- Solve one and two-step problems in different contexts Study Guide
- Solve problems using bar charts, pictograms and tables Study Guide
- Use the additive relationship to rearrange addition equations Study Guide
- Use the additive relationship to rearrange and solve equations Study Guide
- Use the additive relationship to rearrange subtraction equations Study Guide
Browse all guides in the Year 3 Maths guide library.