Homework Help: LCMs/Adding unlike fractions

Posted by Alex L. on Sunday, October 9, 2011 at 9:05pm.

Find the least common multiple in each set of numbers.

1) 8,9,12,18
2) 6,8,9,27,36

I have trouble factoring the denominators in this one.

3/7 + 2/5 + 1/10

LCMs/Adding unlike fractions - Bandit, Sunday, October 9, 2011 at 9:12pm
try a lcd of 70
LCMs/Adding unlike fractions - Reiny, Sunday, October 9, 2011 at 9:21pm
The LCM is that smallest whole number that each of your given numbers divide into
8 = 2x2x2
9 = 3x3
12 = 2x2x3
18 = 2x3x3

so looking at those, I will need three 2' and two 3's
LCM = 2x2x2x3x3 = 72

As to your second one,

7 = 1x7
5 = 1x5
10 = 2x5

So your lowest common denominator, or the LCM, is
7x5x2 = 70
LCMs/Adding unlike fractions - Alex L., Monday, October 10, 2011 at 1:07pm
I need to rewrite the fractions so that all the denominators are the same.

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