Year 2 - Maths
Add and subtract two numbers that bridge through 10
Calculating within 20
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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 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 add and subtract using strategies to bridge 10.
Key Notes
- Partition the addend so that you can make a number pair to 10
- The remaining part can be added to 10
- Partition the part being subtracted so that one of its smaller parts is equal to the ones digit.
- The remaining part can be subtracted from 10
- Bridging through 10 can be represented on a number line.
Vocabulary To Learn
- Partition: The act of splitting an object or value down into smaller parts.
- Whole: All of a group or number.
- Part: A piece or section of the whole.
- Bridging 10: Addition or subtraction that crosses the 10 boundary.
Common Mistakes To Avoid
- Children may make mistakes when adopting more mental strategies.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Partition the addend so that you can make a number pair to 10. The remaining part can be added to 10.
2. Use this key word in a maths sentence and explain it clearly. 'Partition'
The act of splitting an object or value down into smaller parts. 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 make mistakes when adopting more mental strategies. Correction: Leave scaffolds in place until showing confidence in verbal explanation. For example, once confident visualising 'making 10' using the ten frame, remove the scaffold of the ten frame and counters.
More Lessons In This Unit
- Add three addends Study Guide
- Add three addends efficiently Study Guide
- Add three addends efficiently by finding two addends that total 10 Study Guide
- Add two numbers that bridge through 10 Study Guide
- Calculate the difference Study Guide
- Calculate the difference in different contexts Study Guide
- Calculate the difference when information is presented in a bar chart Study Guide
- Calculate the difference when information is presented in a pictogram Study Guide
- Compare the number of objects in two sets or difference between two measures. Study Guide
- Explain that the addends can be added in any order Study Guide
- Explain what the difference is between consecutive numbers Study Guide
- Use a 'First, then, then, now' story to add three addends Study Guide
- Use knowledge of calculating within 20 to solve problems Study Guide
- Use knowledge of calculating within 20 to solve problems involving statistics Study Guide
Browse all guides in the Year 2 Maths guide library.