Year 1 - Maths
Combining and partitioning numbers within 10
Solving problems in a range of contexts
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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 have the opportunity to apply their knowledge of counting, comparing and number facts to solve problems in a range of contexts.
Lesson Summary
You will learn to use your knowledge of combining and partitioning numbers within 10 when solving problems.
Key Notes
- We can combine two parts to make a whole. Part + part = whole
- We can partition a whole into two parts.
- We can partition a part from a whole. Whole − part = part
Vocabulary To Learn
- Combine: To join or merge two or more parts together.
- Partition: The act of splitting an object or value into smaller parts.
- Whole: All of a group or number.
- Part: A piece or section of the whole.
Common Mistakes To Avoid
- Children might record that numbers can only be partitioned in one way.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
We can combine two parts to make a whole. Part + part = whole. We can partition a whole into two parts.
2. Use this key word in a maths sentence and explain it clearly. 'Combine'
To join or merge two or more parts 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 might record that numbers can only be partitioned in one way. Correction: Children here have the chance to explore how numbers can be partitioned in many different ways. Narrate when exploring these different ways throughout, using ___ is the whole, ___ is a part and ___ is a part.
More Lessons In This Unit
Browse all guides in the Year 1 Maths guide library.