Free Grade 3 Working with Imperial Units Lesson Plans
Free Grade 3 lesson plans for Working with Imperial 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
25 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain working with imperial units
Explain working with imperial units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with imperial units
Calculate working with imperial units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with imperial units
Compare working with imperial units accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify working with imperial units
Justify working with imperial 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 Imperial 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 cm to mm.[1]
- 2.Convert 9 m to cm.[1]
- 3.Convert 4 m to cm.[1]
- 4.Convert 6 L to mL.[1]
- 5.Convert 3.2 m to cm.[2]
- 6.Convert 7.7 m to cm.[2]
- 7.Convert 3.8 cm to mm.[2]
- 8.Convert 5.3 L to mL.[2]
- 9.Convert 1.8 L to mL.[3]
- 10.Convert 6.4 cm to mm.[3]
- 11.Convert 9.2 cm to mm.[3]
- 12.Convert 5.2 m to cm.[3]
Show answers and working
1. 20 mm
1 cm = 10 mm. 2 × 10 = 20 mm.
2. 900 cm
1 m = 100 cm. 9 × 100 = 900 cm.
3. 400 cm
1 m = 100 cm. 4 × 100 = 400 cm.
4. 6000 mL
1 L = 1000 mL. 6 × 1000 = 6000 mL.
5. 320 cm
1 m = 100 cm. 3.2 × 100 = 320 cm.
6. 770 cm
1 m = 100 cm. 7.7 × 100 = 770 cm.
7. 38 mm
1 cm = 10 mm. 3.8 × 10 = 38 mm.
8. 5300 mL
1 L = 1000 mL. 5.3 × 1000 = 5300 mL.
9. 1800 mL
1 L = 1000 mL. 1.8 × 1000 = 1800 mL.
10. 64 mm
1 cm = 10 mm. 6.4 × 10 = 64 mm.
11. 92 mm
1 cm = 10 mm. 9.2 × 10 = 92 mm.
12. 520 cm
1 m = 100 cm. 5.2 × 100 = 520 cm.
Worked examples
Convert 3 m to cm.
- 1 m = 100 cm.
- 3 × 100 = 300 cm.
- Answer: 300 cm
Convert 6.6 km to m.
- 1 km = 1000 m.
- 6.6 × 1000 = 6600 m.
- Answer: 6600 m
Convert 5.7 cm to mm.
- 1 cm = 10 mm.
- 5.7 × 10 = 57 mm.
- Answer: 57 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 Working with Imperial Units
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Frequently asked
- Is this Grade 3 Working with Imperial 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 Imperial Units, Metric 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 Imperial Units?
- Move on to Imperial Units in Context, Metric Units, Converting Units, Compound Units, which build directly on this idea.
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