Year 1 - Maths
Find the missing part of an addition story
Additive structures: addition and subtraction
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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 find missing addends in equations. They will partition a whole into 2 parts representing first, then, now stories with subtraction equations. They will learn + and - are inverse operations.
Lesson Summary
You will learn to find the missing part of a 'First, then, now' addition story.
Key Notes
- When we know two parts of a 'First, then, now' story, we can find the missing part.
Vocabulary To Learn
- First: Before anything else
- Then: After something in time.
- Add: To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another.
- Increased: Make something larger / greater (in size or quantity).
Common Mistakes To Avoid
- Children may add the parts instead of subtracting a part to find the missing amount.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
When we know two parts of a 'First, then, now' story, we can find the missing part. When we know two parts of a 'First, then, now' story, we can find the missing part.
2. Use this key word in a maths sentence and explain it clearly. 'First'
Before anything else. 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 add the parts instead of subtracting a part to find the missing amount. Correction: Give plenty of opportunities to act out stories and solve problems with practical objects. Encourage children to think about the size of the missing part in relation to the known parts, i.e. whether it will be larger or smaller than the other parts.
More Lessons In This Unit
- Create addition and subtraction stories Study Guide
- Find the missing part in addition and subtraction stories Study Guide
- Find the missing part of a subtraction story Study Guide
- Furthering understanding of subtraction as decreasing an amount Study Guide
- Interpret and represent addition stories Study Guide
- Interpret and represent subtraction stories Study Guide
- Know that addition and subtraction are inverse operations Study Guide
- Represent the inverse relationship between addition and subtraction Study Guide
- Understand subtraction as decreasing an amount Study Guide
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