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Math Help - Metric Scale: convert from cm to m

  1. #1
    ladyninjaaa
    Guest

    Metric Scale: convert from cm to m

    Hello there

    I dont know how to use the 'metric scales' ruler.

    I have to use the scale 1:50 for drafting and the numbers on the rules are in meters.

    i've been given the measurements in cm. for example, my stairs raiser is 30 cm.

    How do i use the scale ruler? I have to convert cm to m. Please help! I know that 1 m = 100 cm, but why does 30 cm look so small on the paper. it shouldnt be this small!

    this is how my ruler looks like : http://www.artsupply.com/alvin/740PM.jpg

    i found this image but i am not exactly sure what does it mean. http://www.design-skills.org/graphic...e/1m_scale.gif

    Thank you
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  2. #2
    Newbie
    Joined
    Mar 2008
    Posts
    3

    Thumbs up

    You are probably doing fine, as 30cms using a scale of 1:50 is actually very small.

    Looking at the image you sent of the different scales, look at the 1:50 one. This small line represents 1meter, or 100cm. Since you're stair riser is 30cm, it is going to be approximately 1/3 the length of this short line. Is that approximately the length you are drafting?


    [QUOTE=ladyninjaaa;117284]Hello there

    I dont know how to use the 'metric scales' ruler.

    I have to use the scale 1:50 for drafting and the numbers on the rules are in meters.

    i've been given the measurements in cm. for example, my stairs raiser is 30 cm.

    You are working with a 1:50 scale

    1meter = 100cm
    Using the scale

    1 meter is REPRESENTED by 100/50 = 2cm
    Divide this by 20
    5cm is REPRESENTED by 1mm

    You could use this on your scale ruler.

    Every length you have to draw, divide it by 5 and the length of the line you have to draft is your answer times 1mm

    So your 30cm

    30/5 = 6

    You draft a line of 6mm

    I hope this helps
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