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the least common denominator is 4
multiply 7/8 by 5 and 3/20 by 2...then just add
Look like the LCD is 40. It is 40 as both 8 and 20 will divide into it and it is the smallest number that will do that as 8 won't go into 20
that's what i'm trying to look for thankk yhuuu :)
but i still dnt get it LOL
Well when you work it out you get
35/40 - 6/40 = 29/40
If you will review the above you will see that to convert to lowest common denominator you are actually only multiplying the fraction. In this case the firs was multiplied by 5/5 or 1, the second by 2/2 or 1, and when you multiply by 1 you don't change the value of the fraction.....just the appearance.
oh well what about
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Smallest number that both 20 and 15 will both go into is 60. LCD is 60
11 (3) 8 (4)
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33 32 1
------- - -------- = ----
60 60 60