SOLUTION: Find the sum or difference. - 11/12 - -7/15 Thanks sooooooo much! Happy Holidays!

Question 64980This question is from textbook Pre-Algebra
: Find the sum or difference. - 11/12 - -7/15

Thanks sooooooo much! Happy Holidays! This question is from textbook Pre-Algebra

Answer by ptaylor(2198) (Show Source): You can put this solution on YOUR website!
Find the sum or difference. - 11/12 - -7/15 First off, lets rewrite it noting that (-)(-)=(+):
-11/12--7/15=
-11/12+7/15 Next we'll multiply both terms by 60/60. (60 is the lowest common multiple (LCM) of 12 & 15). We are doing this in order to get a common denominator for both terms. When we get a common denomator, we can start simplifying the resulting fraction.

(-11/12)(60/60)+(7/15)(60/60)=
((-11)(5))/60+((7)(4))/60 simplifying we have:
(-55+28)/60=
-27/60 reducing the fraction we get
((-3)(9))/((3)(20))=
-9/20
Hope this helps. Happy holidays----ptaylor
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