Addition or subtraction of fractions require "like" fractions: that is, fractions with the same denominator.
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Pick two of the fractions and find the Least Common Multiple of those two denominators. Then take that number, and find the Least Common Multiple between that and the third denominator. This number will be the Least Common Denominator between the three fractions.If you don't care to find the Least common denominator, then just take the three denominators, and multiply them together.
The way that you can find the least common denominator is by first multiplying the 2 bottom numbers and whatever the product is that is your common denominator. to find the smallest one, you have to keep dividing it till it is in counting order or there is an odd number.
A common denominator is 7.A common denominator is 7.A common denominator is 7.A common denominator is 7.
You need to find the common denominator in order to add or subtract them. You can only add or subtract "like things" and by finding a common denominator you make both rational expressions into things that can be added or subtracted.
To find a common denominator for 7 and 8, we need to find the least common multiple (LCM) of the two numbers, which is 56. Therefore, a proper fraction with a denominator that is common to 7 and 8 would be any fraction with 56 as the denominator, such as 3/56 or 7/56.