Free Grade 3 Converting Units Lesson Plans
Free Grade 3 lesson plans for 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
Higher
35 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify converting units
Identify converting units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain converting units
Explain converting units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate converting units
Calculate converting units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare converting units
Compare 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 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 4 L to mL.[1]
- 2.Convert 7 m to cm.[1]
- 3.Convert 4 cm to mm.[1]
- 4.Convert 8 km to m.[1]
- 5.Convert 6.5 kg to g.[2]
- 6.Convert 9.8 km to m.[2]
- 7.Convert 5.1 km to m.[2]
- 8.Convert 6.4 kg to g.[2]
- 9.Convert 9.6 L to mL.[3]
- 10.Convert 2.9 km to m.[3]
- 11.Convert 2.1 cm to mm.[3]
- 12.Convert 8.8 m to cm.[3]
Show answers and working
1. 4000 mL
1 L = 1000 mL. 4 × 1000 = 4000 mL.
2. 700 cm
1 m = 100 cm. 7 × 100 = 700 cm.
3. 40 mm
1 cm = 10 mm. 4 × 10 = 40 mm.
4. 8000 m
1 km = 1000 m. 8 × 1000 = 8000 m.
5. 6500 g
1 kg = 1000 g. 6.5 × 1000 = 6500 g.
6. 9800 m
1 km = 1000 m. 9.8 × 1000 = 9800 m.
7. 5100 m
1 km = 1000 m. 5.1 × 1000 = 5100 m.
8. 6400 g
1 kg = 1000 g. 6.4 × 1000 = 6400 g.
9. 9600 mL
1 L = 1000 mL. 9.6 × 1000 = 9600 mL.
10. 2900 m
1 km = 1000 m. 2.9 × 1000 = 2900 m.
11. 21 mm
1 cm = 10 mm. 2.1 × 10 = 21 mm.
12. 880 cm
1 m = 100 cm. 8.8 × 100 = 880 cm.
Worked examples
Convert 9 kg to g.
- 1 kg = 1000 g.
- 9 × 1000 = 9000 g.
- Answer: 9000 g
Convert 6.7 kg to g.
- 1 kg = 1000 g.
- 6.7 × 1000 = 6700 g.
- Answer: 6700 g
Convert 2.4 kg to g.
- 1 kg = 1000 g.
- 2.4 × 1000 = 2400 g.
- Answer: 2400 g
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 Converting Units
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Frequently asked
- Is this Grade 3 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 Imperial Units, 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 Converting Units?
- Move on to Compound Units, Time, Money, which build directly on this idea.
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