Year 1 - Maths
Comparing lengths
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 use the language of comparing numbers to compare different lengths.
Key Notes
- Lengths can be compared using longer, taller and shorter.
- A length can be the longest tallest or the shortest of a set of measurements.
- Height is a type of length.
- Lengths can be equal to one another.
- Objects can be ordered by height and length.
Vocabulary To Learn
- Length: How long from end to end.
- Height: How tall from bottom to top.
- Longest: The object in a set that is longer than all the others.
- Shortest: The object in a set that is shorter than all the others.
- Tallest: The object in a set that is taller than all the others.
Common Mistakes To Avoid
- When comparing objects, children may think that one is longer or taller because they have not aligned them to start at the same point.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Lengths can be compared using longer, taller and shorter. A length can be the longest tallest or the shortest of a set of measurements.
2. Use this key word in a maths sentence and explain it clearly. 'Length'
How long from end to end. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: When comparing objects, children may think that one is longer or taller because they have not aligned them to start at the same point. Correction: Encourage children to place objects on a flat surface such as a table when comparing height, or against a wall when comparing length to make sure that they have the same start point.
More Lessons In This Unit
- 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 addition and subtraction problems involving length Study Guide
- Solve problems by measuring different lengths in cm using a ruler Study Guide
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