Year 4 - Maths
Use and explain the most efficient strategies when subtracting quantities of money
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 will learn to use and explain the most efficient strategies when subtracting quantities of money.
Key Notes
- Informal calculation strategies such as rounding and compensating can be applied to calculating with money.
- Same sum generalisation can be applied to calculating with money.
- Column subtraction can be used to calculate with money but is not always the most efficient strategy.
Vocabulary To Learn
- Minuend: The minuend is the number being subtracted from.
- Subtrahend: The subtrahend is a number subtracted from another.
- Difference: The difference is the result after subtracting one number from another.
Common Mistakes To Avoid
- Pupils will often default to using the column subtraction method even when it is inefficient.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Informal calculation strategies such as rounding and compensating can be applied to calculating with money. Same sum generalisation can be applied to calculating with money.
2. Use this key word in a maths sentence and explain it clearly. 'Minuend'
The minuend is the number being subtracted from. 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 often default to using the column subtraction method even when it is inefficient. Correction: The slide deck gives examples of when column subtraction can be replaced by quicker, more efficient methods, such as 'counting on'.
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 knowledge of addition to add commonly used prices efficiently Study Guide
- Use knowledge of subtraction to calculate change when paying with whole pounds or notes Study Guide
Browse all guides in the Year 4 Maths guide library.