Free Grade 3 Introducing Imaginary Unit Common Errors Worksheets
Free Grade 3 worksheets 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
Core
35 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 9 L to mL.[1]
- 2.Convert 6 cm to mm.[1]
- 3.Convert 2 cm to mm.[1]
- 4.Convert 6 L to mL.[1]
- 5.Convert 3 L to mL.[2]
- 6.Convert 5.4 cm to mm.[2]
- 7.Convert 3.9 cm to mm.[2]
- 8.Convert 5.8 L to mL.[2]
- 9.Convert 6.1 L to mL.[3]
- 10.Convert 6.4 kg to g.[3]
- 11.Convert 8.9 L to mL.[3]
- 12.Convert 9.3 cm to mm.[3]
Show answers and working
1. 9000 mL
1 L = 1000 mL. 9 × 1000 = 9000 mL.
2. 60 mm
1 cm = 10 mm. 6 × 10 = 60 mm.
3. 20 mm
1 cm = 10 mm. 2 × 10 = 20 mm.
4. 6000 mL
1 L = 1000 mL. 6 × 1000 = 6000 mL.
5. 3000 mL
1 L = 1000 mL. 3 × 1000 = 3000 mL.
6. 54 mm
1 cm = 10 mm. 5.4 × 10 = 54 mm.
7. 39 mm
1 cm = 10 mm. 3.9 × 10 = 39 mm.
8. 5800 mL
1 L = 1000 mL. 5.8 × 1000 = 5800 mL.
9. 6100 mL
1 L = 1000 mL. 6.1 × 1000 = 6100 mL.
10. 6400 g
1 kg = 1000 g. 6.4 × 1000 = 6400 g.
11. 8900 mL
1 L = 1000 mL. 8.9 × 1000 = 8900 mL.
12. 93 mm
1 cm = 10 mm. 9.3 × 10 = 93 mm.
Worked examples
Convert 8 cm to mm.
- 1 cm = 10 mm.
- 8 × 10 = 80 mm.
- Answer: 80 mm
Convert 9 m to cm.
- 1 m = 100 cm.
- 9 × 100 = 900 cm.
- Answer: 900 cm
Convert 9.1 kg to g.
- 1 kg = 1000 g.
- 9.1 × 1000 = 9100 g.
- Answer: 9100 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 worksheet really free?
- Yes. Every worksheets 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 worksheet 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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