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.

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  • M O R M E N

    7 years agoPosted 7 years ago. Direct link to M O R M E N's post “What about micrometers?”

    What about micrometers?

    (44 votes)

    • Sarah Lawson Tozier

      4 years agoPosted 4 years ago. Direct link to Sarah Lawson Tozier's post “#1, I love the name, #2, ...”

      Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (4)

      Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (5)

      #1, I love the name, #2, A micrometer is 1000 times smaller than a centimeter.

      (49 votes)

  • madilyn.hunter

    7 years agoPosted 7 years ago. Direct link to madilyn.hunter's post “Is there anything before ...”

    Is there anything before 'Millimeter' and after 'Kilometer' ?

    (17 votes)

    • robkingston0

      6 years agoPosted 6 years ago. Direct link to robkingston0's post “technically, as with any ...”

      Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (9)

      technically, as with any SI unit, yes there is.
      practically: smaller than milli meter: yes. larger than kilo meter: no
      this table shows all the possible prefixes: https://en.wikipedia.org/wiki/Metric_prefix

      in physics, you occasionally come across nano meters, one nanometer = 10^-9 meters or 0.000000001 meters

      going bigger, you could technically have a mega meter which would be 1000 kilometers, but i have never seen this in practice and most people would misunderstand you (in a metric country)

      (19 votes)

  • 12ecofsky

    a year agoPosted a year ago. Direct link to 12ecofsky's post “What is the difference be...”

    What is the difference between km and M?

    (11 votes)

    • Usman Chouhan

      a year agoPosted a year ago. Direct link to Usman Chouhan's post “a km is a kilometer, and ...”

      Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (13)

      Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (14)

      a km is a kilometer, and an M is a meter. There are 1,000 meters in a kilometer. In other words, one meter is 1/1,000 of a kilometer or 0.001 of a kilometer.

      (25 votes)

  • Cow Fungus

    5 years agoPosted 5 years ago. Direct link to Cow Fungus's post “I get messed up with km t...”

    I get messed up with km to mm.

    (6 votes)

    • Ian Pulizzotto

      5 years agoPosted 5 years ago. Direct link to Ian Pulizzotto's post “Converting from km to m r...”

      Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (18)

      Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (19)

      Converting from km to m requires multiplying by 1,000, because there are 1,000 m in one km.

      Converting m to mm requires multiplying by 1,000, because there are 1,000 mm in one m.

      It follows from these two facts that converting from km to mm requires multiplying by 1,000*1,000=1,000,000.

      Have a blessed, wonderful day!

      (34 votes)

  • 25cscott

    6 years agoPosted 6 years ago. Direct link to 25cscott's post “How many millimeters are ...”

    How many millimeters are in 5 meters?

    (10 votes)

    • MC

      6 years agoPosted 6 years ago. Direct link to MC's post “5000 millimeters”

      Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (23)

      5000 millimeters

      (23 votes)

  • Shandra

    6 years agoPosted 6 years ago. Direct link to Shandra's post “Is there more measurement...”

    Is there more measurements than just this?

    (17 votes)

    • Rochel

      4 years agoPosted 4 years ago. Direct link to Rochel's post “Yes- nanometers and micro...”

      Yes- nanometers and micrometers are some smaller measurements

      (8 votes)

  • Nancy Smith

    5 years agoPosted 5 years ago. Direct link to Nancy Smith's post “I have one tree that is 4...”

    I have one tree that is 4 meters tall a second tree that is 3 m tall how many centimeters taller is the first tree

    (6 votes)

    • Alabro, Luke T.

      5 years agoPosted 5 years ago. Direct link to Alabro, Luke T.'s post “`100 cm is the answer`”

      Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (30)

      100 cm is the answer

      (24 votes)

  • Usman Chouhan

    a year agoPosted a year ago. Direct link to Usman Chouhan's post “Okay so if y'all don't ge...”

    Okay so if y'all don't get this, let me give you an example. So, 1 kilogram = 1,000 grams, right? So, if the question asks you how many grams are 4 kilograms, you multiply 4 by 1,000 which is 4,000. Because if 1 kilogram = 1,000 grams, 4 must be 4,000 grams.

    (16 votes)

    • KAP

      a year agoPosted a year ago. Direct link to KAP's post “thx for that”

      thx for that

      (0 votes)

  • AJW

    2 years agoPosted 2 years ago. Direct link to AJW's post “Is there such thing as a ...”

    Is there such thing as a decimeter?

    (7 votes)

    • Ian Pulizzotto

      2 years agoPosted 2 years ago. Direct link to Ian Pulizzotto's post “Yes! A decimeter is 1/10...”

      Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (37)

      Yes! A decimeter is 1/10 of a meter. This also means a decimeter is 10 centimeters, and a decimeter is 100 millimeters.

      (14 votes)

  • zatankanwai

    2 years agoPosted 2 years ago. Direct link to zatankanwai's post “What about kilometers to ...”

    What about kilometers to miles ?

    (6 votes)

    • Ian Pulizzotto

      2 years agoPosted 2 years ago. Direct link to Ian Pulizzotto's post “Good question!To conver...”

      Metric units of length review (mm, cm, m, & km) (article) | Khan Academy (41)

      Good question!

      To convert from kilometers to miles, divide by 1.609344. For approximate calculations, dividing by 1.6 is good.

      Have a blessed, wonderful day!

      (11 votes)

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

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