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Second/Measurement

Convert Centimeters and Millimeters

Convert between centimeters and millimeters using whole numbers. Students learn that 10 millimeters equals 1 centimeter, practicing metric system conversions with simple divisible numbers that result in whole number answers.
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WorksheetsTeacher InfoLearning Path

Preview

Convert Centimeters and Millimeters preview

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What to Do Next
Convert Centimeters and Millimeters - With Decimals6 WS
83 mm = ___ cm

Practice Questions

  1. 10 mm = ? cm
    Show answer

    1

  2. 20 mm = ? cm
    Show answer

    2

  3. 50 mm = ? cm
    Show answer

    5

  4. 100 mm = ? cm
    Show answer

    10

  5. 3 cm = ? mm
    Show answer

    30

Quick Tip
10 mm = 1 cm
Teacher Resources
Teaching Notes

10 millimeters = 1 centimeter. Metric conversions use powers of 10, making them easier than customary. Use metric rulers showing both units.

Vocabulary
Centimeter: A metric unit of length.
Millimeter: A smaller metric unit of length.
Common Mistakes
  • Confusing with other metric conversions
  • Place value errors with 10
  • Mixing up multiplication/division
  • Incorrectly applying the 10:1 ratio
  • Forgetting units in answers
Differentiation
SupportUse metric ruler. Show that moving decimal point works for 10s.
ChallengeMix with other metric units. Compare ease of metric vs customary conversions.
Discussion Questions
  • Why is metric easier?
  • What countries use metric exclusively?
  • When is it better to use centimeters?
  • When is it better to use millimeters?
  • How is this conversion like multiplying by 10?
  • Can you name other metric units of length?
Extension Activities
  • Compare metric and customary rulers
  • Research metric system history
Parent Tip

Use a ruler to show centimeters and millimeters on everyday objects.

Learning Path
Skill Cluster

Measurement & Data

Estimated Time

12 minutes

Skills Practiced
Metric conversionCentimeters millimetersPlace value