Free Grade 3 Working with Converting Units Lesson Plans
Free Grade 3 lesson plans for Working with Converting 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
30 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain working with converting units
Explain working with converting units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with converting units
Calculate working with converting units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with converting units
Compare working with converting units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify working with converting units
Justify working with converting 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 Converting 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 kg to g.[1]
- 2.Convert 8 km to m.[1]
- 3.Convert 3 cm to mm.[1]
- 4.Convert 2 km to m.[1]
- 5.Convert 3.8 m to cm.[2]
- 6.Convert 6 L to mL.[2]
- 7.Convert 4.5 cm to mm.[2]
- 8.Convert 2.3 kg to g.[2]
- 9.Convert 8.4 cm to mm.[3]
- 10.Convert 5.1 km to m.[3]
- 11.Convert 8.6 km to m.[3]
- 12.Convert 4.5 m to cm.[3]
Show answers and working
1. 2000 g
1 kg = 1000 g. 2 × 1000 = 2000 g.
2. 8000 m
1 km = 1000 m. 8 × 1000 = 8000 m.
3. 30 mm
1 cm = 10 mm. 3 × 10 = 30 mm.
4. 2000 m
1 km = 1000 m. 2 × 1000 = 2000 m.
5. 380 cm
1 m = 100 cm. 3.8 × 100 = 380 cm.
6. 6000 mL
1 L = 1000 mL. 6 × 1000 = 6000 mL.
7. 45 mm
1 cm = 10 mm. 4.5 × 10 = 45 mm.
8. 2300 g
1 kg = 1000 g. 2.3 × 1000 = 2300 g.
9. 84 mm
1 cm = 10 mm. 8.4 × 10 = 84 mm.
10. 5100 m
1 km = 1000 m. 5.1 × 1000 = 5100 m.
11. 8600 m
1 km = 1000 m. 8.6 × 1000 = 8600 m.
12. 450 cm
1 m = 100 cm. 4.5 × 100 = 450 cm.
Worked examples
Convert 5 kg to g.
- 1 kg = 1000 g.
- 5 × 1000 = 5000 g.
- Answer: 5000 g
Convert 2.8 cm to mm.
- 1 cm = 10 mm.
- 2.8 × 10 = 28 mm.
- Answer: 28 mm
Convert 3.3 m to cm.
- 1 m = 100 cm.
- 3.3 × 100 = 330 cm.
- Answer: 330 cm
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 Converting Units
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Frequently asked
- Is this Grade 3 Working with Converting 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 Converting Units, Imperial Units. 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 Converting Units?
- Move on to Converting Units in Context, Metric Units, Imperial Units, Compound Units, which build directly on this idea.
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