Year 1 - Maths
Solve addition and subtraction problems involving length
Numbers 0 to 20 in different 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 will consolidate their counting to 20. They will measure objects using non-standard and standard measures and record outcomes, providing a context for counting and comparing numbers to 20.
Lesson Summary
You will learn to solve addition and subtraction problems involving length.
Key Notes
- Addition and subtraction problems both involve a whole and its parts.
- You can think about addition and subtraction stories involving length and identify the whole and its parts.
- When you join two items together, you can add their lengths together to find the total length.
- When you remove part of an object, you subtract the amount you have removed to find the length of the remaining part.
Vocabulary To Learn
- Part: A piece or section of the whole.
- Whole: All of something. Complete.
Common Mistakes To Avoid
- Children may confuse standard and non-standard units, for example measuring the height of a tower by counting the blocks rather than using a ruler to measure its length in centimetres.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Addition and subtraction problems both involve a whole and its parts. You can think about addition and subtraction stories involving length and identify the whole and its parts.
2. Use this key word in a maths sentence and explain it clearly. 'Part'
A piece or section of the whole. 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 confuse standard and non-standard units, for example measuring the height of a tower by counting the blocks rather than using a ruler to measure its length in centimetres. Correction: Use prompts such as, 'How many centimetres tall is this tower?' and, 'The first part of the tower is 10cm tall.' to reinforce the use of centimetres as a standard unit of measure.
More Lessons In This Unit
- Comparing lengths Study Guide
- Estimate and measure length and record results in a table Study Guide
- Estimate length in cm Study Guide
- Measure items using centimetre cubes and record results in a table Study Guide
- Measure length using a ruler Study Guide
- Measure length using centimetre cubes Study Guide
- Measure length using objects Study Guide
- Measure length using objects and record results in a table Study Guide
- Solve problems by measuring different lengths in cm using a ruler Study Guide
Browse all guides in the Year 1 Maths guide library.