Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (2024)

Review the size of millimeters, centimeters, meters, and kilometers and how to convert between them. Then, try some practice problems.

Want to join the conversation?

As an enthusiast well-versed in the topic of measurement units and conversions, I bring forth a wealth of knowledge to elucidate the concepts explored in the discussion. My expertise is rooted in a comprehensive understanding of the metric system, particularly the units of millimeters, centimeters, meters, and kilometers.

Let's delve into the information shared in the conversation:

  1. Micrometers:

    • A micrometer is mentioned by Sarah Lawson Tozier as being 1000 times smaller than a centimeter.
    • Micrometers are not explicitly discussed further, but they represent a unit of length equal to one millionth of a meter (1 micrometer = 10^-6 meters).
  2. Metric Prefixes:

    • robkingston0 provides valuable information on metric prefixes, directing users to a table of prefixes on Wikipedia.
    • nano meters are introduced, where one nanometer is equal to 10^-9 meters (0.000000001 meters).
  3. Meters and Kilometers:

    • Usman Chouhan clarifies that a kilometer (km) is 1000 meters (m), emphasizing that 1 meter is 1/1000 of a kilometer.
  4. Conversions:

    • Ian Pulizzotto explains the conversion process between kilometers, meters, and millimeters. Converting from km to m requires multiplying by 1000, and converting from m to mm requires multiplying by 1000 as well. Therefore, converting from km to mm involves multiplying by 1,000,000 (1000 * 1000).
  5. Practice Problems:

    • 25cscott poses a practice problem: "How many millimeters are in 5 meters?" This problem can be solved by multiplying 5 meters by 1000 (1 meter = 1000 mm).

    • MC states "5000 millimeters," which aligns with the conversion mentioned above.

    • Nancy Smith presents a real-world scenario involving tree heights, asking how many centimeters taller the first tree is. This question involves converting meters to centimeters.

    • deez nuts cadice inquires about the length relationships between meters and kilometers, showcasing an interest in conversion.

    • Cavan P offers insight into the meaning of the prefix 'kilo,' stating that there are 1000 meters in every kilometer and 0.001 kilometers in every meter.

In conclusion, the conversation covers a spectrum of topics related to length measurements, metric prefixes, and conversion between different units, demonstrating a collective effort to understand and apply these fundamental concepts in practical scenarios.

Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (2024)
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