Year 1 - Maths
Partition a whole into two parts and write as a subtraction equation
Additive structures: addition
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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 combine 2 or more parts to make a whole. They will learn addends can be represented in any order and that the = sign shows the whole and sum of the parts are equal.
Lesson Summary
You will learn to partition a whole into two parts and express this as a subtraction equation.
Key Notes
- When the whole and one part of the whole is known, subtraction can be used to find the missing part.
- This can be represented with a subtraction equation.
- The minus sign can be used to show that one part has been split or separated from the whole group.
Vocabulary To Learn
- Subtract: To separate or take away one number from another, or to decrease an amount.
- Minus sign: The symbol in an equation which shows that a number has been partitioned, taken away or decreased.
- Partition: The act of splitting an object or value down into smaller parts.
- Known part: A piece or section of the whole that is known.
- Unknown part: A piece or section of the whole that is not known.
Common Mistakes To Avoid
- Children may forget to start with the whole group when writing subtraction equations.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
When the whole and one part of the whole is known, subtraction can be used to find the missing part. This can be represented with a subtraction equation.
2. Use this key word in a maths sentence and explain it clearly. 'Subtract'
To separate or take away one number from another, or to decrease an amount. 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 forget to start with the whole group when writing subtraction equations. Correction: Maintain a strong focus throughout on what the numbers in equations represent. Explore mistakes that are made to clarify understanding.
More Lessons In This Unit
- Add parts to find the value of the whole and write the equation Study Guide
- Combine parts using the addition symbol Study Guide
- Find the missing part in an equation Study Guide
- Understand addition as increasing a quantity Study Guide
- Understand that parts can be represented in any order Study Guide
- Understand the relationship between addition and subtraction Study Guide
- Understand the use of the equals sign in equations Study Guide
- Understanding part-part-whole relationships Study Guide
- Using bar models to subtract Study Guide
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