Can you also use the lcm of the denominator of the fractions to rewrite the difference 8/15-1/6? what is the difference?

So to add or subtract fractions, the bottom number must be the same

so we need to make the bottom numbers the same without changing the fraction itself

exg to change 1/4 to 4/16 you multiply 1/4 by 4/4 (which equals 1) to get 4/16

so we need to find the Least Common Multiple or the smallest number that each can multiply into so

first we find the factors
15=3 times 5
6=2 times 3

we find the numbers in both of them
there is one 2, one 3, and one 5 so 2 times 3 times 5 or 30

the LCM=30

8/15 times 2/2 (or 1)=16/30
1/6 times 5/5 (or 1)=5/30
16/30-6/30=(16-5)/30=11/30