Year 4 - Maths
Use knowledge of subtraction to calculate change when paying with whole pounds or notes
Money: apply efficient strategies when calculating with money
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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 explain represent and compare whole pounds and pence. They will convert quantities of money between pounds and pence and use the most efficient and reliable strategy to find the change.
Lesson Summary
You can use knowledge of subtraction to calculate change when paying with whole pounds or notes.
Key Notes
- The whole is the amount of money offered, one part is the total cost and the other part is the change.
- The change is the difference between the total cost and the amount of money given.
- You can use different subtraction strategies to calculate change.
Vocabulary To Learn
- Difference: The result of subtracting one number from another is the difference.
- Change: In money, change is the difference between the amount of money you use to pay and the value of what you are buying.
- Number bonds: Number bonds are pairs of numbers which sum together to make another number.
Common Mistakes To Avoid
- Pupils will sometimes give incorrect number bond examples such as as 63 + 47 = 100
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The whole is the amount of money offered, one part is the total cost and the other part is the change. The change is the difference between the total cost and the amount of money given.
2. Use this key word in a maths sentence and explain it clearly. 'Difference'
The result of subtracting one number from another is the difference. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils will sometimes give incorrect number bond examples such as as 63 + 47 = 100. Correction: Model adding together the tens first.
More Lessons In This Unit
- Calculate change when purchasing several items Study Guide
- Convert quantities of money between pounds and pence Study Guide
- Explain and represent whole pounds and pence as a quantity of money Study Guide
- Explain and represent whole pounds as a quantity of money Study Guide
- Explain how to compare amounts of money without converting Study Guide
- Solve a range of problems, including finding change Study Guide
- Use and explain the most efficient strategies when adding quantities of money Study Guide
- Use and explain the most efficient strategies when subtracting quantities of money Study Guide
- Use knowledge of addition to add commonly used prices efficiently Study Guide
Browse all guides in the Year 4 Maths guide library.