Length, mass and capacity
What length, mass and capacity means
You learn to choose the right unit for everyday things. Small objects like a pencil use centimetres, heavy things like rice use kilograms, and liquids like water use litres.
What you will practise
- Choose centimetres for short objects and lengths
- Choose metres for longer distances and bigger items
- Choose grams or kilograms for light and heavy mass
- Choose litres for water, juice and other liquids
- Compare two measurements using the same unit
Before you start
You should already know basic numbers and how to count. It also helps if you can recognise common classroom objects and simple containers.
Not confident yet? Work through Ghanaian money (GH₵) first.
Worked example
One question from this skill's own question bank, shown with its full working.
Which unit is best for measuring the length of a pencil?
- kilometres
- centimetres
- litres
- kilograms
Working: A pencil is short, so centimetres (cm) are appropriate.
Common mistakes to avoid
- Using kilograms for a pencil instead of centimetres. Pick a small length unit for short objects.
- Measuring liquids in grams or centimetres. Liquids are measured in litres, not in length or mass units.
- Choosing metres for very small objects. Use centimetres when the item is short and easy to hold.
- Mixing up grams and kilograms. Use grams for light things and kilograms for heavier things.
Curriculum and exam alignment
This topic normally appears in Lower Primary measurement work, where pupils compare and measure familiar objects. It supports school-based continuous assessment and end-of-term tests through short questions on the correct unit to use.
Curriculum notes are a general guide to where this work normally sits. Always check the syllabus your school or examination body is currently using.
Related skills
Other Measurement & Money skills in Maths, at the same point in the course.
Other Maths topics
Related study guides
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Exams that assess length, mass and capacity
Lower Primary work on this skill feeds directly into these exam papers. Each page lists the Maths topics that appear on it.
How this page was produced
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Practise length, mass and capacity
6 questions with a worked answer after every attempt, and a SmartScore that tracks how close you are to mastery.
