Study Hub

Study Guides

This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.

Back to Study HubBrowse Year 2 Maths Guides

Year 2 - Maths

Add three addends efficiently by finding two addends that total 10

Calculating within 20

Unit Summary

In this unit pupils will add 3 addends. They will use a strategy such as finding 2 addends to total 10 or 2 numbers to bridge though 10.

Lesson Summary

You will learn to use your knowledge of number pairs to 10 to add three addends efficiently.

Key Notes

  • The order of the addends can change and the sum stays the same.
  • When adding three addends, it is efficient to first find two addends that sum to 10
  • ___ add ___ is equal to 10 Then, 10 add ___ is equal to ___

Vocabulary To Learn

  • Addends: Any of the numbers that are added together.
  • Number pairs: Two numbers that sum to make 10
  • Efficient: Not wasting time or effort. An efficient strategy is one we can carry out easily.

Common Mistakes To Avoid

  • If children record incorrectly, they could re-add an addend that has already been used to make a pair to 10

3 Quick Questions (With Answers)

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

The order of the addends can change and the sum stays the same. When adding three addends, it is efficient to first find two addends that sum to 10.

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

Any of the numbers that are added together. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: If children record incorrectly, they could re-add an addend that has already been used to make a pair to 10. Correction: Carefully model how to record thinking, rewriting the new equation inclusive of 10 underneath.

More Lessons In This Unit

Browse all guides in the Year 2 Maths guide library.