First/Measurement
Convert Centimeters and Millimeters - With Decimals
Convert between centimeters and millimeters including decimal answers. Students work with measurements like 83 millimeters equals 8.3 centimeters, applying division and multiplication with decimals in metric conversions.
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Practice Questions
- 15 mm = ? cm
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1.5
- 23 mm = ? cm
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2.3
- 47 mm = ? cm
Show answer
4.7
- 2.5 cm = ? mm
Show answer
25
- 6.8 cm = ? mm
Show answer
68
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Quick Tip
10 mm = 1 cm
Teacher Resources
Teaching Notes
Introduces decimals in metric conversion: 15 mm = 1.5 cm. Students see practical use of decimals. Connect to place value: tenths place.
Vocabulary
Millimeter: A metric unit of length.
Centimeter: A metric unit of length, 10 mm.
Common Mistakes
- Decimal point placement
- Confusing 1.5 with 15
- Forgetting to use decimal
- Incorrect decimal placement
- Multiplying instead of dividing
- Dividing instead of multiplying
- Forgetting units in answer
Differentiation
SupportUse place value chart. Show 10 mm = 1.0 cm pattern first.
ChallengeInclude measurements like 2.7 cm to mm. Real precision measurement scenarios.
Discussion Questions
- When do we need decimal precision?
- Why does metric work well with decimals?
- When might you need to convert cm to mm?
- How is this similar to multiplying/dividing by 10?
- Why are decimals useful in measurement?
- What other metric units can you convert?
Extension Activities
- Measure small objects precisely
- Scientific measurement practice
Parent Tip
Help your child measure small items around the house using a ruler.
Learning Path
Skill Cluster
Measurement & Decimals
Estimated Time
14 minutes
Skills Practiced
Decimal metric conversionPlace value decimalsMetric fluency