Year 3 - Maths
Measuring length and height using cm and mm
Measuring length and recording in tables
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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 continue to measure using appropriate tools and units progressing to using a wider range of measures, including comparing and using mixed units.
Lesson Summary
You will learn to measure length and height using mm or whole cm and mm.
Key Notes
- The length or height of objects can be measured in mm or in whole cm and mm.
- It is more efficient to start at zero when measuring.
- If the object is not lined up with zero, then the difference needs to be found.
Vocabulary To Learn
- millimetre: A millimetre is a standardised unit of measurement. We can abbreviate millimetre to mm.
- centimetre: A centimetre is a standardised unit of measurement. We can abbreviate centimetre to cm.
- difference: The difference is the result of subtracting one number from another.
Common Mistakes To Avoid
- The length or height of an object is the numerical value at the end of the ruler (if not at zero).
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The length or height of objects can be measured in mm or in whole cm and mm. It is more efficient to start at zero when measuring.
2. Use this key word in a maths sentence and explain it clearly. 'millimetre'
A millimetre is a standardised unit of measurement. We can abbreviate millimetre to mm. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: The length or height of an object is the numerical value at the end of the ruler (if not at zero). Correction: If an object is not measured from zero, its length is the difference between the numerical value at the start and end of the object.
More Lessons In This Unit
- Converting between centimetres and millimetres Study Guide
- Converting between metres and centimetres Study Guide
- Estimate and measure lengths and heights and record in a table Study Guide
- Estimate in metres and describe a metre in different ways Study Guide
- Measure length and height from zero using whole m or cm Study Guide
- Millimetres as a unit of measure and the relationship between them and cm Study Guide
- Solve problems involving length Study Guide
- Solve problems involving length and height Study Guide
- Using graphs to represent lengths and heights Study Guide
Browse all guides in the Year 3 Maths guide library.