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Year 3 - Maths

Numbers can be added in any order

Review strategies for adding and subtracting across 10

Unit Summary

In this unit pupils will be reviewing and securing previous knowledge of adding 3 addends, understanding they can be added in any order and combined in different ways to bridge through 10

Lesson Summary

You understand that numbers can be added in any order.

Key Notes

  • The order we add the addends does not change the sum.
  • Addition is commutative.
  • Commutative means that we can change the order of the addends and the sum stays the same.

Vocabulary To Learn

  • addend: A number added to another.
  • commutative: Addition is commutative. This means the order of the addends can be changed without changing the calculation or sum.
  • equation: An equation is used to show that one number or calculation is equal to another.
  • sum: The sum is the total after numbers are added together.

Common Mistakes To Avoid

  • Pupils perceive the equals sign = as 'where the answer goes' and struggle with writing equations.

3 Quick Questions (With Answers)

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

The order we add the addends does not change the sum. Addition is commutative.

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

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 perceive the equals sign = as 'where the answer goes' and struggle with writing equations. Correction: Show pupils that the equals sign represents balance and that equations are equal on both sides of the sign. Balance scales can be used.

More Lessons In This Unit

Browse all guides in the Year 3 Maths guide library.