Free Grade 3 Introducing Imaginary Unit Common Errors Quizzes
Free Grade 3 quizzes for Introducing Imaginary Unit Common Errors: 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
Foundation
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain introducing imaginary unit common errors
Explain introducing imaginary unit common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing imaginary unit common errors
Calculate introducing imaginary unit common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing imaginary unit common errors
Compare introducing imaginary unit common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify introducing imaginary unit common errors
Justify introducing imaginary unit common errors 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 Common Errors 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 4 m to cm.[1]
- 3.Convert 6 kg to g.[1]
- 4.Convert 4 km to m.[1]
- 5.Convert 8 L to mL.[2]
- 6.Convert 5.4 L to mL.[2]
- 7.Convert 4.2 kg to g.[2]
- 8.Convert 9.8 cm to mm.[2]
- 9.Convert 1.9 m to cm.[3]
- 10.Convert 2.4 kg to g.[3]
- 11.Convert 4.7 km to m.[3]
- 12.Convert 5.7 L to mL.[3]
Show answers and working
1. 50 mm
1 cm = 10 mm. 5 × 10 = 50 mm.
2. 400 cm
1 m = 100 cm. 4 × 100 = 400 cm.
3. 6000 g
1 kg = 1000 g. 6 × 1000 = 6000 g.
4. 4000 m
1 km = 1000 m. 4 × 1000 = 4000 m.
5. 8000 mL
1 L = 1000 mL. 8 × 1000 = 8000 mL.
6. 5400 mL
1 L = 1000 mL. 5.4 × 1000 = 5400 mL.
7. 4200 g
1 kg = 1000 g. 4.2 × 1000 = 4200 g.
8. 98 mm
1 cm = 10 mm. 9.8 × 10 = 98 mm.
9. 190 cm
1 m = 100 cm. 1.9 × 100 = 190 cm.
10. 2400 g
1 kg = 1000 g. 2.4 × 1000 = 2400 g.
11. 4700 m
1 km = 1000 m. 4.7 × 1000 = 4700 m.
12. 5700 mL
1 L = 1000 mL. 5.7 × 1000 = 5700 mL.
Worked examples
Convert 7 km to m.
- 1 km = 1000 m.
- 7 × 1000 = 7000 m.
- Answer: 7000 m
Convert 3.9 cm to mm.
- 1 cm = 10 mm.
- 3.9 × 10 = 39 mm.
- Answer: 39 mm
Convert 2.8 kg to g.
- 1 kg = 1000 g.
- 2.8 × 1000 = 2800 g.
- Answer: 2800 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.
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Frequently asked
- Is this Grade 3 Introducing Imaginary Unit Common Errors 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 Introducing Imaginary Unit Word Problems, Introducing Imaginary Unit Techniques, 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 Common Errors?
- Move on to Working with Imaginary Unit, Imaginary Unit in Context, which build directly on this idea.
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