Say there's 2/3 and 1/2, it's called Least Common Denominator, so you need to look at the denominators which are 3 and 2.
Now list the multiples:
3: 1, 3, 6...
2: 1, 2, 4, 6...
As you can see both of them go into 6 the least amount of times because it's the one that they both can multiply.
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LCD means lowest common denominator which is needed when adding or subtracting fractions that have different denominators.
The LCD for fractions is the LCM (least common multiple) of all of the denominators.
No sure way.just list the factors and circle common ones
No
Because to add or subtract two fractions you first have to find equivalent fractions for both which have the same denominator.