Free Grade 3 Imaginary Unit in Context Flashcards
Free Grade 3 flashcards for Imaginary Unit in Context: 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.
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15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify imaginary unit in context
Identify imaginary unit in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain imaginary unit in context
Explain imaginary unit in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate imaginary unit in context
Calculate imaginary unit in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare imaginary unit in context
Compare imaginary unit in context 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 Imaginary Unit in Context 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 6 kg to g.[1]
- 2.Convert 5 kg to g.[1]
- 3.Convert 4 L to mL.[1]
- 4.Convert 2 km to m.[1]
- 5.Convert 9.6 m to cm.[2]
- 6.Convert 2.3 L to mL.[2]
- 7.Convert 1.5 L to mL.[2]
- 8.Convert 4.7 km to m.[2]
- 9.Convert 2.5 kg to g.[3]
- 10.Convert 8.4 L to mL.[3]
- 11.Convert 8.7 kg to g.[3]
- 12.Convert 3 m to cm.[3]
Show answers and working
1. 6000 g
1 kg = 1000 g. 6 × 1000 = 6000 g.
2. 5000 g
1 kg = 1000 g. 5 × 1000 = 5000 g.
3. 4000 mL
1 L = 1000 mL. 4 × 1000 = 4000 mL.
4. 2000 m
1 km = 1000 m. 2 × 1000 = 2000 m.
5. 960 cm
1 m = 100 cm. 9.6 × 100 = 960 cm.
6. 2300 mL
1 L = 1000 mL. 2.3 × 1000 = 2300 mL.
7. 1500 mL
1 L = 1000 mL. 1.5 × 1000 = 1500 mL.
8. 4700 m
1 km = 1000 m. 4.7 × 1000 = 4700 m.
9. 2500 g
1 kg = 1000 g. 2.5 × 1000 = 2500 g.
10. 8400 mL
1 L = 1000 mL. 8.4 × 1000 = 8400 mL.
11. 8700 g
1 kg = 1000 g. 8.7 × 1000 = 8700 g.
12. 300 cm
1 m = 100 cm. 3 × 100 = 300 cm.
Worked examples
Convert 3 cm to mm.
- 1 cm = 10 mm.
- 3 × 10 = 30 mm.
- Answer: 30 mm
Convert 6.5 km to m.
- 1 km = 1000 m.
- 6.5 × 1000 = 6500 m.
- Answer: 6500 m
Convert 5.4 kg to g.
- 1 kg = 1000 g.
- 5.4 × 1000 = 5400 g.
- Answer: 5400 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 Imaginary Unit in Context flashcards really free?
- Yes. Every flashcards 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 Working with Imaginary Unit, Introducing Imaginary Unit, Real Numbers. Each one has its own free lesson, worksheet and quiz.
- How is the flashcards 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 Imaginary Unit in Context?
- Move on to Argand Diagram, Complex Arithmetic, Modulus and Argument, which build directly on this idea.
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