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Choose appropriate units of length

Choosing an appropriate unit of length means matching the unit’s size and scale to the object or distance, such as centimeters or inches for small objects, meters or feet for room-sized lengths, and kilometers or miles for long distances. The learner estimates before measuring, recognizes that smaller units require more units to cover the same length, and selects a unit that gives a useful, reasonable measurement; formal conversion among units and greater precision are not included.

Detailed Explanation: Choose appropriate units of length

Choose a unit that matches the size of the object.

  1. Look at the object and estimate its length.
  2. Choose a unit that seems reasonable:
    • Inches or centimeters for small objects
    • Feet or meters for objects about room size
    • Miles or kilometers for very long distances
  3. Remember: smaller units need more units to measure the same length.

Example: Choose a unit to measure the length of a pencil.

  • A pencil is a small object, so its length is probably only a few inches or centimeters.
  • Meters would be too large. Saying a pencil is 1 meter long would not be reasonable.
  • Centimeters are a good choice because many small centimeter units can fit along the pencil.

So, we would measure the pencil in centimeters. A reasonable measurement might be about 1818 centimeters.

Learn by doing: Choose appropriate units of length

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    Measurement Reasonable Value - Length (customary)

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