Free Grade 3 Working with Compound Units Worksheets
Free Grade 3 worksheets for Working with 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
Stretch
20 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain working with compound units
Explain working with compound units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with compound units
Calculate working with compound units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with compound units
Compare working with compound units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify working with compound units
Justify working with 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 Working with 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 m to cm.[1]
- 2.Convert 4 m to cm.[1]
- 3.Convert 5 m to cm.[1]
- 4.Convert 7 km to m.[1]
- 5.Convert 1.2 L to mL.[2]
- 6.Convert 9.5 km to m.[2]
- 7.Convert 1.7 cm to mm.[2]
- 8.Convert 7.5 m to cm.[2]
- 9.Convert 2.2 cm to mm.[3]
- 10.Convert 3.4 km to m.[3]
- 11.Convert 2.6 m to cm.[3]
- 12.Convert 3.9 km to m.[3]
Show answers and working
1. 300 cm
1 m = 100 cm. 3 × 100 = 300 cm.
2. 400 cm
1 m = 100 cm. 4 × 100 = 400 cm.
3. 500 cm
1 m = 100 cm. 5 × 100 = 500 cm.
4. 7000 m
1 km = 1000 m. 7 × 1000 = 7000 m.
5. 1200 mL
1 L = 1000 mL. 1.2 × 1000 = 1200 mL.
6. 9500 m
1 km = 1000 m. 9.5 × 1000 = 9500 m.
7. 17 mm
1 cm = 10 mm. 1.7 × 10 = 17 mm.
8. 750 cm
1 m = 100 cm. 7.5 × 100 = 750 cm.
9. 22 mm
1 cm = 10 mm. 2.2 × 10 = 22 mm.
10. 3400 m
1 km = 1000 m. 3.4 × 1000 = 3400 m.
11. 260 cm
1 m = 100 cm. 2.6 × 100 = 260 cm.
12. 3900 m
1 km = 1000 m. 3.9 × 1000 = 3900 m.
Worked examples
Convert 2 cm to mm.
- 1 cm = 10 mm.
- 2 × 10 = 20 mm.
- Answer: 20 mm
Convert 8.7 km to m.
- 1 km = 1000 m.
- 8.7 × 1000 = 8700 m.
- Answer: 8700 m
Convert 5.4 L to mL.
- 1 L = 1000 mL.
- 5.4 × 1000 = 5400 mL.
- Answer: 5400 mL
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 Working with Compound Units
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Frequently asked
- Is this Grade 3 Working with 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 Introducing Compound Units, Converting Units. 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 Working with Compound Units?
- Move on to Compound Units in Context, Metric Units, Imperial Units, Converting Units, which build directly on this idea.
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