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Grade 3/Measurement

Convert Meters, Centimeters, and Millimeters

Multi-step conversions between meters, centimeters, and millimeters. Students learn that 100 centimeters equals 1 meter and 1000 millimeters equals 1 meter, working with larger numbers like converting 8,000 centimeters to 80 meters.
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WorksheetsTeacher InfoLearning Path

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Easy
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12 questions
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12 questions
Medium
1
12 questions
2
12 questions
Hard
1
12 questions
2
12 questions
Prerequisites
Convert Centimeters and Millimeters7 WS
80 mm = ___ cm
Convert Centimeters and Millimeters - With Decimals6 WS
83 mm = ___ cm
What to Do Next
⚖️ Convert Ounces and Pounds6 WS
6 lb = ___ oz

Practice Questions

  1. 100 cm = ? m
    Show answer

    1

  2. 500 cm = ? m
    Show answer

    5

  3. 3 m = ? cm
    Show answer

    300

  4. 1,000 mm = ? m
    Show answer

    1

  5. 2 m = ? mm
    Show answer

    2000

Quick Tip
10 mm = 1 cm   |   100 cm = 1 m
Teacher Resources
Teaching Notes

100 cm = 1 m, 1000 mm = 1 m, 10 mm = 1 cm. Students work with three related units. Pattern: all powers of 10.

Vocabulary
Meter: A metric unit of length.
Centimeter: A metric unit of length, 100 per meter.
Millimeter: A metric unit of length, 1000 per meter.
Common Mistakes
  • Mixing up 100 and 1000
  • Forgetting intermediate conversions
  • Incorrect conversion factor (100 vs 1000).
  • Multiplying instead of dividing (or vice versa).
  • Misplacing the decimal point.
  • Not completing all conversion steps.
Differentiation
SupportProvide conversion ladder. Do two steps: meters→cm→mm.
ChallengeDirect conversions (meters to mm). Multi-step word problems.
Discussion Questions
  • How are all metric conversions related?
  • Why use meters vs centimeters?
  • Why is the metric system helpful globally?
  • When might you need to convert units in daily life?
  • How does place value relate to metric conversions?
  • What is the relationship between mm, cm, and m?
Extension Activities
  • Create metric conversion chart
  • Measure large and small objects
Parent Tip

Use a tape measure to show your child how meters, centimeters, and millimeters relate.

Learning Path
Skill Cluster

Measurement & Data

Estimated Time

15 minutes

Skills Practiced
Three unit metricMeters conversionMetric mastery