Free Grade 3 Introducing Imaginary Unit Quizzes
Free Grade 3 quizzes for Introducing Imaginary Unit: 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
25 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain introducing imaginary unit
Explain introducing imaginary unit accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing imaginary unit
Calculate introducing imaginary unit accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing imaginary unit
Compare introducing imaginary unit accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify introducing imaginary unit
Justify introducing imaginary unit 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 Introducing Imaginary Unit 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 5 cm to mm.[1]
- 2.Convert 7 L to mL.[1]
- 3.Convert 9 m to cm.[1]
- 4.Convert 3 cm to mm.[1]
- 5.Convert 8.6 kg to g.[2]
- 6.Convert 1.2 L to mL.[2]
- 7.Convert 5.6 L to mL.[2]
- 8.Convert 7.1 cm to mm.[2]
- 9.Convert 1.5 cm to mm.[3]
- 10.Convert 4.2 cm to mm.[3]
- 11.Convert 2.4 cm to mm.[3]
- 12.Convert 3.3 cm to mm.[3]
Show answers and working
1. 50 mm
1 cm = 10 mm. 5 × 10 = 50 mm.
2. 7000 mL
1 L = 1000 mL. 7 × 1000 = 7000 mL.
3. 900 cm
1 m = 100 cm. 9 × 100 = 900 cm.
4. 30 mm
1 cm = 10 mm. 3 × 10 = 30 mm.
5. 8600 g
1 kg = 1000 g. 8.6 × 1000 = 8600 g.
6. 1200 mL
1 L = 1000 mL. 1.2 × 1000 = 1200 mL.
7. 5600 mL
1 L = 1000 mL. 5.6 × 1000 = 5600 mL.
8. 71 mm
1 cm = 10 mm. 7.1 × 10 = 71 mm.
9. 15 mm
1 cm = 10 mm. 1.5 × 10 = 15 mm.
10. 42 mm
1 cm = 10 mm. 4.2 × 10 = 42 mm.
11. 24 mm
1 cm = 10 mm. 2.4 × 10 = 24 mm.
12. 33 mm
1 cm = 10 mm. 3.3 × 10 = 33 mm.
Worked examples
Convert 5 m to cm.
- 1 m = 100 cm.
- 5 × 100 = 500 cm.
- Answer: 500 cm
Convert 2.5 cm to mm.
- 1 cm = 10 mm.
- 2.5 × 10 = 25 mm.
- Answer: 25 mm
Convert 2.4 m to cm.
- 1 m = 100 cm.
- 2.4 × 100 = 240 cm.
- Answer: 240 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 Introducing Imaginary Unit
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Learn — Meet the idea.
Practice — Build fluency.
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Frequently asked
- Is this Grade 3 Introducing Imaginary Unit quiz really free?
- Yes. Every quizzes 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 Real Numbers. Each one has its own free lesson, worksheet and quiz.
- How is the quiz 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 Introducing Imaginary Unit?
- Move on to Working with Imaginary Unit, Imaginary Unit in Context, Argand Diagram, Complex Arithmetic, which build directly on this idea.
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