Ah, the LCM stands for the Least Common Multiple. When we talk about the LCM of 1 over 2, we are looking for the smallest number that both 1 and 2 can divide into evenly. Since 1 and 2 have no common factors other than 1, the LCM of 1 and 2 is simply their product, which is 2.
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3/9 reduces to 1/3 4/8 reduces to 1/2 6 is the LCM to solve: 1/3 = 2/6 1/2 = 3/6 Summing gives 5/6.
1 and 2 has an LCM of 2.
To subtract 1/4 from 1/8, you have to find the LCM, which is 8. 1/4 has to be changed to eighths, which is 2/8. 1/8 - 2/8 is -1/8.
The LCM is 60.
6 = 2 x 3 8 = 2 x 2 x 2 LCM = 2 x 2 x 2 x 3 = 24