Grade 4/Measurement
Convert mm and cm (966)
Convert lengths between millimeters and centimeters.
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Quick Tip
10 mm (millimeter) = 1 cm (centimeter)
Teacher Resources
Teaching Notes
This collection focuses on convert mm and cm. Ensure students understand the base-10 nature of the metric system. Use rulers and meter sticks for hands-on learning.
Vocabulary
Centimeter: A metric unit of length, 1/100 of a meter.
Millimeter: A metric unit of length, 1/1000 of a meter.
Common Mistakes
- Confusing the conversion factors (e.g., 10 vs 100)
- Multiplying instead of dividing or vice versa
- Forgetting to label units
- Misplacing the decimal point
- Forgetting the factor of 10.
- Incorrectly multiplying/dividing.
- Switching units in the answer.
- Not labeling the converted unit.
Differentiation
SupportProvide a conversion chart. Use concrete examples like the width of a finger (cm) or thickness of a dime (mm).
ChallengeChallenge students to convert across multiple steps (e.g., mm to m) or use decimals.
Discussion Questions
- Why is the metric system easier to use than customary units?
- When would you use kilometers instead of meters?
- How does multiplying by 10, 100, or 1000 change a number?
- When is it useful to convert between mm and cm?
- What everyday objects are best measured in mm?
- What everyday objects are best measured in cm?
- How does multiplication or division by 10 help?
Extension Activities
- Measure objects in the classroom.
- Estimate lengths before measuring.
- Create a 'Metric Olympics' event.
Parent Tip
Use a ruler to show the difference between cm and mm markings.
Learning Path
Skill Cluster
Measurement and Data
Estimated Time
15 minutes
Skills Practiced
convert mm and cm
Prerequisites
- Understanding of length measurement
- Multiplication and division by 10
Next Steps
- Convert m and cm
- Convert km and m
- Solving word problems with conversions
- Metric Measurement Word Problems