Free Grade 3 Units Flashcards
Free Grade 3 flashcards for 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
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify units
Identify units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain units
Explain units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate units
Calculate units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare units
Compare 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 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 4 L to mL.[1]
- 2.Convert 6 m to cm.[1]
- 3.Convert 4 m to cm.[1]
- 4.Convert 2 L to mL.[1]
- 5.Convert 1.3 cm to mm.[2]
- 6.Convert 7.7 km to m.[2]
- 7.Convert 2.1 L to mL.[2]
- 8.Convert 7.5 cm to mm.[2]
- 9.Convert 2.4 L to mL.[3]
- 10.Convert 3.7 km to m.[3]
- 11.Convert 4.5 km to m.[3]
- 12.Convert 7.9 cm to mm.[3]
Show answers and working
1. 4000 mL
1 L = 1000 mL. 4 × 1000 = 4000 mL.
2. 600 cm
1 m = 100 cm. 6 × 100 = 600 cm.
3. 400 cm
1 m = 100 cm. 4 × 100 = 400 cm.
4. 2000 mL
1 L = 1000 mL. 2 × 1000 = 2000 mL.
5. 13 mm
1 cm = 10 mm. 1.3 × 10 = 13 mm.
6. 7700 m
1 km = 1000 m. 7.7 × 1000 = 7700 m.
7. 2100 mL
1 L = 1000 mL. 2.1 × 1000 = 2100 mL.
8. 75 mm
1 cm = 10 mm. 7.5 × 10 = 75 mm.
9. 2400 mL
1 L = 1000 mL. 2.4 × 1000 = 2400 mL.
10. 3700 m
1 km = 1000 m. 3.7 × 1000 = 3700 m.
11. 4500 m
1 km = 1000 m. 4.5 × 1000 = 4500 m.
12. 79 mm
1 cm = 10 mm. 7.9 × 10 = 79 mm.
Worked examples
Convert 2 cm to mm.
- 1 cm = 10 mm.
- 2 × 10 = 20 mm.
- Answer: 20 mm
Convert 9.9 L to mL.
- 1 L = 1000 mL.
- 9.9 × 1000 = 9900 mL.
- Answer: 9900 mL
Convert 1.4 km to m.
- 1 km = 1000 m.
- 1.4 × 1000 = 1400 m.
- Answer: 1400 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 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 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 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 Units?
- Move on to Time, Money, Number Sense, Algebra, which build directly on this idea.
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