Year 2 - Maths
Explain that the addends can be added in any order
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 explain that the addends can be added in any order.
Key Notes
- When we add three numbers, the sum will be the same whichever pair of addends we add first.
- The order of the addends can change and the sum will stay the same.
Vocabulary To Learn
- Addends: Any numbers that are added together.
- Efficient: Not wasting time or effort. An efficient strategy is one we can carry out easily.
- Strategy: A plan or method to achieve a specific goal.
Common Mistakes To Avoid
- Children may not understand that either pair of addends can be added first and the sum will remain the same.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
When we add three numbers, the sum will be the same whichever pair of addends we add first. The order of the addends can change and the sum will stay the same.
2. Use this key word in a maths sentence and explain it clearly. 'Addends'
Any 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: Children may not understand that either pair of addends can be added first and the sum will remain the same. Correction: Use concrete materials to represent the addends for children to explore, discussing what is the same (the addends) and what is different (the pair being added first).
More Lessons In This Unit
- Add and subtract two numbers that bridge through 10 Study Guide
- 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 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.