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Converting and Calculating Units of Length

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What are Metric Units of Length? (0:01)

Metric units of length are used to measure distances and sizes accurately. The most common metric units are:

  • Millimeters (mm): Smallest unit here, used for tiny objects.
    1 mm is about the thickness of a credit card.
  • Centimeters (cm): Common for everyday objects.
    1 cm is about the width of a fingernail.
  • Meters (m): Used for measuring rooms, furniture, or height.
    1 m is about the height of a chair.
  • Kilometers (km): Used for long distances.
    1 km is about the distance between two bus stops.

How to Convert Between Units of Lengths? (0:50)

You need to remember these key conversions between units of lengths:

  • 1 mm = 0.1 cm
  • 1 cm = 10 mm
  • 1 m = 100 cm
  • 1 km = 1000 m

Example 1: Converting 47 meters to centimeters

  1. Meters to centimeters → Multiply by 100 (since 1 m = 100 cm).
  2. $47 \times 100 = 4700$
  3. So, 47 meters = 4700 centimeters ✅

Example 2: Converting 5020 meters to kilometers

  1. Meters to kilometers → Divide by 1,000 (since 1 km = 1000 m).
  2. $5020 \div 1000 = 5.020$
  3. So, 5020 meters = 5.02 kilometers ✅

How to Add and Subtract Different Units of Length? (2:34)

When performing calculations with different length units, convert to the same unit first.

Example 1: Adding 1.75 m and 40 cm

  1. Convert 40 cm to m: $40 \text{ cm} = 0.4 \text{ m}$
  2. Add the values in meters: $1.75 \text{ m} + 0.4 \text{ m} = 2.15 \text{ m}$
  3. Final Answer: 2.15 m ✅ 

Example 2: Subtracting 40 cm from 1.75 m

  1. Convert 1.75 m to cm: $1.75 \text{ m} = 175 \text{ cm}$
  2. Subtract the values in cm: $175 \text{ cm} – 40 \text{ cm} = 135 \text{ cm}$
  3. (Optional) Convert back to m: $135 \text{ cm} = 1.35 \text{ m}$
  4. Final Answer: 1.35 m ✅

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Converting and Calculating Units of Length

1 / 6

Q: Convert 2 meters to centimeters.

2 / 6

Q: Convert 3.6 kilometers to meters.

3 / 6

 Q: Which is longer: 2500 millimeters or 2.5 meters?

4 / 6

Q: Subtract 250 cm from 5.5 meters. What is the result?

5 / 6

Q: Add 2.5 meters and 150 centimeters. What is the total length?

6 / 6

Q: Convert 0.085 kilometers to centimeters.

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