Year 3 - Maths
Use the additive relationship to rearrange addition equations
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 rearrange addition equations.
Key Notes
- Equations can be represented using part-part-whole or bar models.
- The sum is the whole and the addends are parts.
- Equations can be written starting with the addends or with the sum.
Vocabulary To Learn
- Addend: An addend is a number added to another.
- Sum: The the total when numbers are added together.
- Equation: An equation shows that one number or calculation is equal to another.
Common Mistakes To Avoid
- Pupils may struggle starting equations with the sum. They may think = means 'the answer is..'
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Equations can be represented using part-part-whole or bar models. The sum is the whole and the addends are parts.
2. Use this key word in a maths sentence and explain it clearly. 'Addend'
An addend is 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: Pupils may struggle starting equations with the sum. They may think = means 'the answer is..'. Correction: Ensure that children understand that 'equals' means that the equation balances (i.e. both sides have the same value.) This could be achieved through using balance scales and attaching the idea of equals with balance.
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
- Understand why the order of addition and subtraction steps can be chosen 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.