Grade 3/Measurement
Convert cm and m (967)
Convert lengths between centimeters and meters.
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Quick Tip
100 cm (centimeter) = 1 m (meter)
Teacher Resources
Teaching Notes
This collection focuses on convert cm and m. Ensure students understand the base-10 nature of the metric system. Use rulers and meter sticks for hands-on learning.
Vocabulary
Meter: A standard metric unit for measuring length.
Centimeter: A metric unit of length, 1/100 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
- Confusing multiplication with division
- Incorrectly moving the decimal point
- Forgetting the 100 ratio
- Mixing up cm and m units
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?
- Why is it important to convert between cm and m?
- When might you use meters instead of centimeters?
- How many centimeters are in 5 meters?
- What happens to the number when converting m to cm?
Extension Activities
- Measure objects in the classroom.
- Estimate lengths before measuring.
- Create a 'Metric Olympics' event.
Parent Tip
Use a tape measure to show how many cm fit into a meter.
Learning Path
Skill Cluster
Measurement and Data
Estimated Time
15 minutes
Skills Practiced
convert cm and m
Prerequisites
- 966
- Understanding length as a concept
- Multiplying and dividing by 100
Next Steps
- Converting other metric length units
- Solving measurement word problems
- Convert mm and cm
- Convert m and km
- Metric System Word Problems