Free Grade 3 Compound Units Worksheets
Free Grade 3 worksheets for Compound Units: 12 real questions with a full answer key and worked solutions. Metric units change by powers of 10: 10 mm in a cm, 100 cm in a m, 1000 m in a km. Multiply to convert to a smaller unit, divide to convert to a bigger one.
Free
Higher
20 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify compound units
Identify compound units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain compound units
Explain compound units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate compound units
Calculate compound units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare compound units
Compare compound units accurately in a familiar context.
Assessed by: Exit ticket of four short items
Prerequisites
Close these gaps first — each has its own free lesson, worksheet and quiz.
How Compound Units works
Metric units change by powers of 10: 10 mm in a cm, 100 cm in a m, 1000 m in a km. Multiply to convert to a smaller unit, divide to convert to a bigger one.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.Convert 3 L to mL.[1]
- 2.Convert 8 kg to g.[1]
- 3.Convert 7 kg to g.[1]
- 4.Convert 8 m to cm.[1]
- 5.Convert 3.5 L to mL.[2]
- 6.Convert 6.9 kg to g.[2]
- 7.Convert 5.9 m to cm.[2]
- 8.Convert 6.3 m to cm.[2]
- 9.Convert 2.5 km to m.[3]
- 10.Convert 6.4 kg to g.[3]
- 11.Convert 6 L to mL.[3]
- 12.Convert 9.1 km to m.[3]
Show answers and working
1. 3000 mL
1 L = 1000 mL. 3 × 1000 = 3000 mL.
2. 8000 g
1 kg = 1000 g. 8 × 1000 = 8000 g.
3. 7000 g
1 kg = 1000 g. 7 × 1000 = 7000 g.
4. 800 cm
1 m = 100 cm. 8 × 100 = 800 cm.
5. 3500 mL
1 L = 1000 mL. 3.5 × 1000 = 3500 mL.
6. 6900 g
1 kg = 1000 g. 6.9 × 1000 = 6900 g.
7. 590 cm
1 m = 100 cm. 5.9 × 100 = 590 cm.
8. 630 cm
1 m = 100 cm. 6.3 × 100 = 630 cm.
9. 2500 m
1 km = 1000 m. 2.5 × 1000 = 2500 m.
10. 6400 g
1 kg = 1000 g. 6.4 × 1000 = 6400 g.
11. 6000 mL
1 L = 1000 mL. 6 × 1000 = 6000 mL.
12. 9100 m
1 km = 1000 m. 9.1 × 1000 = 9100 m.
Worked examples
Convert 4 L to mL.
- 1 L = 1000 mL.
- 4 × 1000 = 4000 mL.
- Answer: 4000 mL
Convert 2.7 cm to mm.
- 1 cm = 10 mm.
- 2.7 × 10 = 27 mm.
- Answer: 27 mm
Convert 1.2 km to m.
- 1 km = 1000 m.
- 1.2 × 1000 = 1200 m.
- Answer: 1200 m
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Divides when converting to a smaller unit.
Correction: Smaller units mean more of them — multiply.
Uses 100 for every conversion.
Correction: Learn which pairs use 10, 100 or 1000.
Teacher tips
- · Keep a conversion staircase on the wall.
Parent tips
- · Weigh fruit at the shop and convert kg to g.
Real-life applications
- · Cooking, measuring height, reading road signs.
Assessment objectives
How mastery is evidenced, and which standards it maps to.
Every free resource for Compound Units
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Learn — Meet the idea.
Practice — Build fluency.
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Assess — Prove mastery.
Apply — Use it in context.
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Frequently asked
- Is this Grade 3 Compound Units worksheet really free?
- Yes. Every worksheets on FreeMathWorksheet is free to use, print and share — no account, no paywall and no watermark.
- What should a learner already know before this?
- Start with Converting Units, Imperial Units, Geometry. Each one has its own free lesson, worksheet and quiz.
- How is the worksheet sequenced?
- Recognition first, then understanding, application, reasoning and finally mastery — the same ladder used across every free resource on the platform.
- What comes next after Compound Units?
- Move on to Time, Money, which build directly on this idea.
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