Year 1 - Maths
Find the missing part in addition and subtraction stories
Additive structures: addition and subtraction
Study Hub
Study Guides
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 solve addition and subtraction stories where the 'end' of the story is missing.
Key Notes
- The more that is added to an amount at the start of an addition, the greater the amount at the end of the story will be.
- The more that is subtracted from the amount at the start of a subtraction, the smaller the amount at the end will be.
Vocabulary To Learn
- Add: To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another.
- Subtract: To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.
Common Mistakes To Avoid
- Children may not have yet formed generalisations about the increase or decrease that takes place when numbers are added or subtracted, so may predict answers that are not logical or possible.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The more that is added to an amount at the start of an addition, the greater the amount at the end of the story will be. The more that is subtracted from the amount at the start of a subtraction, the smaller the amount at the end will be.
2. Use this key word in a maths sentence and explain it clearly. 'Add'
To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another. 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 have yet formed generalisations about the increase or decrease that takes place when numbers are added or subtracted, so may predict answers that are not logical or possible. Correction: Encourage children to generalise by posing errors to reason about, encouraging predictions about what will happen to the size of amounts when adding and subtracting. Encourage use of practical equipment to demonstrate their explanations.
More Lessons In This Unit
- Create addition and subtraction stories Study Guide
- Find the missing part of a subtraction story Study Guide
- Find the missing part of an addition 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
Browse all guides in the Year 1 Maths guide library.