Let's solve this
Metric Units Worksheet step by step. The goal is to choose the
most appropriate unit of measure from the list provided:
kg, cm, ml, km, mm, g, m, tonnes, litres
We'll go through each item and explain why a particular unit is best.
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a) The weight of a hippopotamus
✔ Answer: tonnes
👉 A hippopotamus is very heavy—typically weighing over 1,000 kg. So,
tonnes (1 tonne = 1,000 kg) is the most suitable unit.
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b) The volume of juice in a glass
✔ Answer: ml
👉 A glass of juice holds a small amount of liquid—usually around 200–300 millilitres.
ml (millilitres) is appropriate for small volumes.
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c) The length of a motorway
✔ Answer: km
👉 Motorways are very long—often hundreds of kilometres. So,
km (kilometres) is the correct unit.
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d) The height of your teacher
✔ Answer: m
👉 Human height is usually measured in metres. For example, 1.6 m or 1.7 m. So,
m (metres) is best.
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e) The volume of water in a bath
✔ Answer: litres
👉 A bath holds a large amount of water—around 80–100 litres.
Litres is used for larger volumes of liquid.
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f) The length of a ladybird
✔ Answer: mm
👉 Ladybirds are very small—about 5–8 mm long. So,
mm (millimetres) is the most precise unit.
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g) The weight of an orange
✔ Answer: g
👉 An orange weighs about 150–200 grams.
g (grams) is ideal for small objects like fruit.
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h) The width of a swimming pool
✔ Answer: m
👉 Swimming pools are typically 10–25 metres wide.
m (metres) is the standard unit for such lengths.
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i) The weight of a dog
✔ Answer: kg
👉 Dogs vary in size, but most weigh between 10 kg (small dog) to 40+ kg (large dog). So,
kg (kilograms) is appropriate.
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j) The length of a book
✔ Answer: cm
👉 Books are usually 20–30 centimetres long.
cm (centimetres) is perfect for everyday objects like books.
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Final Answers:
| Question | Answer |
|--------|--------|
| a) The weight of a hippopotamus |
tonnes |
| b) The volume of juice in a glass |
ml |
| c) The length of a motorway |
km |
| d) The height of your teacher |
m |
| e) The volume of water in a bath |
litres |
| f) The length of a ladybird |
mm |
| g) The weight of an orange |
g |
| h) The width of a swimming pool |
m |
| i) The weight of a dog |
kg |
| j) The length of a book |
cm |
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✔ This worksheet helps students understand how to
choose appropriate metric units based on the
size or quantity of what is being measured. It reinforces real-world context for units like millimetres, kilograms, and litres.
Parent Tip: Review the logic above to help your child master the concept of correct unit of measure worksheet.
