Free Grade 3 Compound Units Flashcards
Free Grade 3 flashcards 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
Core
15 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 2 L to mL.[1]
- 2.Convert 4 L to mL.[1]
- 3.Convert 6 km to m.[1]
- 4.Convert 7 km to m.[1]
- 5.Convert 1.4 kg to g.[2]
- 6.Convert 6.2 km to m.[2]
- 7.Convert 9 km to m.[2]
- 8.Convert 8.4 kg to g.[2]
- 9.Convert 7.8 kg to g.[3]
- 10.Convert 7.9 cm to mm.[3]
- 11.Convert 6.2 L to mL.[3]
- 12.Convert 9.6 km to m.[3]
Show answers and working
1. 2000 mL
1 L = 1000 mL. 2 × 1000 = 2000 mL.
2. 4000 mL
1 L = 1000 mL. 4 × 1000 = 4000 mL.
3. 6000 m
1 km = 1000 m. 6 × 1000 = 6000 m.
4. 7000 m
1 km = 1000 m. 7 × 1000 = 7000 m.
5. 1400 g
1 kg = 1000 g. 1.4 × 1000 = 1400 g.
6. 6200 m
1 km = 1000 m. 6.2 × 1000 = 6200 m.
7. 9000 m
1 km = 1000 m. 9 × 1000 = 9000 m.
8. 8400 g
1 kg = 1000 g. 8.4 × 1000 = 8400 g.
9. 7800 g
1 kg = 1000 g. 7.8 × 1000 = 7800 g.
10. 79 mm
1 cm = 10 mm. 7.9 × 10 = 79 mm.
11. 6200 mL
1 L = 1000 mL. 6.2 × 1000 = 6200 mL.
12. 9600 m
1 km = 1000 m. 9.6 × 1000 = 9600 m.
Worked examples
Convert 6 cm to mm.
- 1 cm = 10 mm.
- 6 × 10 = 60 mm.
- Answer: 60 mm
Convert 4.7 m to cm.
- 1 m = 100 cm.
- 4.7 × 100 = 470 cm.
- Answer: 470 cm
Convert 4.4 cm to mm.
- 1 cm = 10 mm.
- 4.4 × 10 = 44 mm.
- Answer: 44 mm
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.
Revise — Keep it in memory.
Assess — Prove mastery.
Apply — Use it in context.
Teach — Deliver it to a class.
Frequently asked
- Is this Grade 3 Compound Units flashcards really free?
- Yes. Every flashcards 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 flashcards 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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