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Year 3 - Maths

Add 3 numbers together in different contexts

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 will learn to represent addition problems using 'first, then, then, now' and bar models.

Key Notes

  • Addition of three addends can be described with a first …, then …, then …, now structure.
  • A bar model can be used to represent a problem with three addends.
  • A number line can be used to represent a problem with three addends.

Vocabulary To Learn

  • addend: A number added to another number.
  • sum: The total when numbers are added together.

Common Mistakes To Avoid

  • Pupils may not be confident in representing addition problems using bar models.

3 Quick Questions (With Answers)

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

Addition of three addends can be described with a first …, then …, then …, now structure. A bar model can be used to represent a problem with three addends.

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

A number added to another number. 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 not be confident in representing addition problems using bar models. Correction: Make connections between bar models, tens frames and 'first...then...then...now' representations. Take time to model examples.

More Lessons In This Unit

Browse all guides in the Year 3 Maths guide library.