Comments on: Help me with math!
http://ask.metafilter.com/41158/Help-me-with-math/
Comments on Ask MetaFilter post Help me with math!Thu, 29 Jun 2006 03:13:52 -0800Thu, 29 Jun 2006 03:13:52 -0800en-ushttp://blogs.law.harvard.edu/tech/rss60Question: Help me with math!
http://ask.metafilter.com/41158/Help-me-with-math
Please help answer a simple math question. <br /><br /> My apologies for the simpleness of this question, but my math skills, terrible at the best of times, have abandoned me due to the whisky. If the ratio in a street directory is 1:26 000, how many kilometres is 14cm? (please show working: I want to figure it out for myself next time)post:ask.metafilter.com,2006:site.41158Thu, 29 Jun 2006 03:10:56 -0800azumamathratioBy: null terminated
http://ask.metafilter.com/41158/Help-me-with-math#633870
<a href="http://www.google.com/search?hs=HQY&hl=en&lr=&safe=off&c2coff=1&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&q=14cm*26000+to+km&btnG=Search">14cm*26000 = 3.64 kilometers</a>comment:ask.metafilter.com,2006:site.41158-633870Thu, 29 Jun 2006 03:13:52 -0800null terminatedBy: null terminated
http://ask.metafilter.com/41158/Help-me-with-math#633873
You may want a simpler explanation:<br>
<br>
1/26000 = 14cm/x<br>
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x = 26000*14cm = 364,000cm<br>
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364,000cm * (1m/100cm) * (1km/1000m) = 3.64kmcomment:ask.metafilter.com,2006:site.41158-633873Thu, 29 Jun 2006 03:23:44 -0800null terminatedBy: outlier
http://ask.metafilter.com/41158/Help-me-with-math#633895
Put the way I worked it out in my head:<br>
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14cm is .14 metres<br>
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.14 metres on the map is .14m * 26,000 in real life<br>
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1000 metres in a kilometre, so thats .14km * 26<br>
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You multiply that all the way out, but I figured that .14 is about 1/7, and so we get 26/7, which is 3 and 5/7, which is about 3 and 2/3, and so 3.66km. Pretty close for an approximation.comment:ask.metafilter.com,2006:site.41158-633895Thu, 29 Jun 2006 05:00:29 -0800outlierBy: weapons-grade pandemonium
http://ask.metafilter.com/41158/Help-me-with-math#634116
Think of it this way: <br>
Things in the real world are 26 000 times bigger than things on the map.comment:ask.metafilter.com,2006:site.41158-634116Thu, 29 Jun 2006 09:12:42 -0800weapons-grade pandemoniumBy: vanoakenfold
http://ask.metafilter.com/41158/Help-me-with-math#634237
The first post is a tad misleading, methinks.<br>
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I've got to do it the visual way, and the first post eliminates an implied step that is useless in this example but applies to other cases where one of the numbers isn't 1.<br>
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In another situation, such as, "if 2 inches = 33 miles, how much is 7 inches?" Line up the figures as so:<br>
<br>
<img src="http://www.thehomeland.org/lj/eq.jpg"><br>
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Multiply crossways (7 x 33 = 231) then divide by the only number remaining unused, 2. (231 / 2 = 115.5) That makes 115.5 (miles).<br>
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The first post multiplied crossways but didn't divide by 1 because anything divided by 1 is the same number. <br>
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For conversions, you can just type "115.5 miles to feet" into google and it'll tell you what it it is.comment:ask.metafilter.com,2006:site.41158-634237Thu, 29 Jun 2006 11:40:21 -0800vanoakenfold