Free Grade 3 Working with Metric Units Lesson Plans
Free Grade 3 lesson plans for Working with Metric 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.
- UnderstandExplain working with metric units
Explain working with metric units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with metric units
Calculate working with metric units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with metric units
Compare working with metric units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify working with metric units
Justify working with metric 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 Metric 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 7 m to cm.[1]
- 2.Convert 9 kg to g.[1]
- 3.Convert 4 m to cm.[1]
- 4.Convert 2 km to m.[1]
- 5.Convert 3.3 m to cm.[2]
- 6.Convert 1.6 kg to g.[2]
- 7.Convert 3 L to mL.[2]
- 8.Convert 2.1 L to mL.[2]
- 9.Convert 8.4 kg to g.[3]
- 10.Convert 9.9 L to mL.[3]
- 11.Convert 9.8 L to mL.[3]
- 12.Convert 7.9 cm to mm.[3]
Show answers and working
1. 700 cm
1 m = 100 cm. 7 × 100 = 700 cm.
2. 9000 g
1 kg = 1000 g. 9 × 1000 = 9000 g.
3. 400 cm
1 m = 100 cm. 4 × 100 = 400 cm.
4. 2000 m
1 km = 1000 m. 2 × 1000 = 2000 m.
5. 330 cm
1 m = 100 cm. 3.3 × 100 = 330 cm.
6. 1600 g
1 kg = 1000 g. 1.6 × 1000 = 1600 g.
7. 3000 mL
1 L = 1000 mL. 3 × 1000 = 3000 mL.
8. 2100 mL
1 L = 1000 mL. 2.1 × 1000 = 2100 mL.
9. 8400 g
1 kg = 1000 g. 8.4 × 1000 = 8400 g.
10. 9900 mL
1 L = 1000 mL. 9.9 × 1000 = 9900 mL.
11. 9800 mL
1 L = 1000 mL. 9.8 × 1000 = 9800 mL.
12. 79 mm
1 cm = 10 mm. 7.9 × 10 = 79 mm.
Worked examples
Convert 4 cm to mm.
- 1 cm = 10 mm.
- 4 × 10 = 40 mm.
- Answer: 40 mm
Convert 9 km to m.
- 1 km = 1000 m.
- 9 × 1000 = 9000 m.
- Answer: 9000 m
Convert 3.9 L to mL.
- 1 L = 1000 mL.
- 3.9 × 1000 = 3900 mL.
- Answer: 3900 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 Metric Units
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Frequently asked
- Is this Grade 3 Working with Metric Units lesson plan really free?
- Yes. Every lesson plans 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 Metric Units, Geometry. Each one has its own free lesson, worksheet and quiz.
- How is the lesson plan 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 Metric Units?
- Move on to Metric Units in Context, Imperial Units, Converting Units, Compound Units, which build directly on this idea.
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