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Mathematics 21 Online
OpenStudy (anonymous):

I need to fill in the question marks to determine equivalent fractions without using a calculator. 5/3=20/12=?/63=?/108

jimthompson5910 (jim_thompson5910):

|dw:1409871707995:dw|

jimthompson5910 (jim_thompson5910):

Notice how 5*4 = 20 and how 3*4 = 12 So if we multiply top and bottom by 4 we get |dw:1409871748338:dw|

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