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Help with ratio 1.0 x 10-2 = 1:100

  1. Feb 9, 2010 #1
    please could you help me understand this is very simple terms.

    1.0 x 10-2 = 1:100

    (as in ten to the power of minus 2)

    i do not understand what i need to do to get it into a ratio.
     
  2. jcsd
  3. Feb 9, 2010 #2

    tiny-tim

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    Hi kaye77! :smile:

    (try using the X2 tag just above the Reply box :wink:)
    A ratio is exactly the same as a fraction.

    So 1.0 x 10-2 = 0.01 = 1/100 = 2/200 = 39.7174/3971.74,

    = 1:100 = 2:200 = 39.7174:3971.74.

    (Any ratio would do, but we usually, though not always choose to start with "1:")

    btw, the only real advantage of the ratio terminology is that you can use it with more than two numbers, which you can't do with fractions

    for example you can write x:y:z = 1:2:3 in one equation (while using fractions would take at least two equations). :smile:
     
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