The denominator is the bottom number of a fraction. Therefore, the denominator of 7/8 (seven eighths) is eight.
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The Least Common Denominator of 3/4 and 7/8 is 8.
It is 168
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.
LCD(5, 8, 7) = 280
1232