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you need to find the "least common denominator"

for example:

1/2 + 1/4 =

The denominators 2 and 4 are not the same. You can't add directly. First find the least common denominator. To do this, ask to yourself which is the least multiple of 2 and 4.

Multiples of 2 = 2, 4, 8, 16

Multiples of 4 = 4, 8, 16, 31

Remember, find the "least." The least is 4. Do not use 8 because it is not the least. Do not use 2 because it is not common to 4.

So now use 4 as the denominator.

Make a huge fraction with 4 as the denomator then follow as directed;

Divide 4 to the first denominator that is 2.

4 / 2 = 2.

Then multiply 2 to the numerator.

2 x 1 = 2.

Now you have your first numerator. Write 2 above your huge fraction then place an "add" sign.

Now, divide 4 to the second denominator that is 4.

4 / 4 = 1.

Then multiply 1 to the numberator of the fraction that is 1.

1 x 1 = 1.

Write 1 beside the addition sign.

Now you can add them properly- 2 + 1 / 4 = 3/4

Therefore; 1/2 + 1/4 = 3/4

It's actually a short process when you fully understand it.

12÷3= 4, 4×2=8

12÷4=3, 3×3=9

so it becomes.. 8/12 + 9/12 = then add.. the answer is 17/12