16 is the common denominator.
3/4=12/16
7/16=7/16
5/8=10/16
8
The denominator is the bottom number of a fraction. Therefore, the denominator of 7/8 (seven eighths) is eight.
A common denominator is 32.
56
At least two fractions are needed in order to determine a common denominator.
24
The Least Common Denominator of 3/4 and 7/8 is 8.
Twenty eighths.
Just do the usual steps to add fractions. First, find the common denominator (8, in this case). Second, convert both fractions to the common denominator. Third, add the numerators.
Two and three-eighths plus one and seven-eighths equals four and two-eighths, which can be to four and one-fourth. Here's how to find the answer. First, you add the two whole numbers together, giving you three. Next, since you are adding two fractions with the same denominator, you add the numerators together, which gives you ten eighths. You then convert that to one and two eighths and add the one to three which is four. Finally, you divide both the numerator and the denominator by two. The final answer is four and one-fourth.
To subtract fractions, find a common denominator. The common denominator of 6 and 8 is 24. Therefore, five sixths is equivalent to twenty-fours sixths, and five eighths is equivalent to twenty-four eighths. Subtracting twenty-four eighths from twenty-four sixths gives an answer of three twenty-fourths.
Convert the fractions to a common denominator, then compare.