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Year 4 - Maths

Efficiently solve subtraction problems (within a whole)

Addition and subtraction of fractions and mixed numbers (within a whole)

Unit Summary

In this unit pupils will make efficient choices about the order they solve an addition and subtraction problem in.

Lesson Summary

You will learn to make efficient choices about the order when solving subtraction problems (within a whole).

Key Notes

  • Mixed numbers can be partitioned in the same way as whole numbers.
  • If fractions have the same denominator, they can be subtracted.
  • To subtract fractions with the same denominator, the language of unitising can be used.

Vocabulary To Learn

  • Mixed number: A mixed number is a whole number and a fraction combined. For example: one and a half is a mixed number.

Common Mistakes To Avoid

  • Children may subtract the incorrect parts of the mixed numbers and/or proper fractions.

3 Quick Questions (With Answers)

1. Solve this in steps: explain the method from this lesson and why each step matters.

Mixed numbers can be partitioned in the same way as whole numbers. If fractions have the same denominator, they can be subtracted.

2. Use this key word in a maths sentence and explain it clearly. 'Mixed number'

A mixed number is a whole number and a fraction combined. For example: one and a half is a mixed number. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: Children may subtract the incorrect parts of the mixed numbers and/or proper fractions. Correction: What is the number that we are subtracting? If this number is a mixed number, partition it into its whole number part and fractional part.Use unitising to support subtraction.

More Lessons In This Unit

Browse all guides in the Year 4 Maths guide library.