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A good strategy for looking for common denominators is to check 2, 3 and/or 5 first.
Since multiples of 5 always end in either 0 or 5, you can eliminate that.
Since multiples of 2 are always even numbers, you can eliminate that from 81.
When you try 3:
81 / 3 = 27
24 / 3 = 8
There 3 is A common denominator. Other numbers may have multiple common denominators (like 30 and 90 which have 2, 3, 5, 6, 15 and 30 in common). So be sure you observe what your question is specifically asking.
What else can I help you with?
Common denominator of 8 and 9?
common denominator of eight and nine
What is the common denominator of 81 and 100?
8100
What is the least common denominator of 8 and 81?
Since 8 is 23 and 81 is 34, the least common denominator is 23 x 34 = 648.
What is the common denominator of 81 and 63?
the number 9
The least common denominator of 81 and 56?
4536
Which fraction is greater 28 over 81 or 7 over 24?
To compare the fractions 28/81 and 7/24, we need to find a common denominator. In this case, the least common multiple of 81 and 24 is 81. We then convert both fractions to have a denominator of 81: 28/81 = 28/81 and 7/24 = 21/81. Now that both fractions have the same denominator, we can compare the numerators directly. Since 28 is greater than 21, the fraction 28/81 is greater than 7/24.
Common denominator of 8 and 9?
common denominator of eight and nine
What is the common denominator of 78 and 81?
3
What is the common denominator of 81 and 100?
8100
What common denominator does 23 and 81 have?
Their product.
What is the lowest common denominator of 8 81onths and 7 24ths?
The LCD of the fractions 8/81 and 7/24 is 648.
What is the least common denominator of 8 and 81?
Since 8 is 23 and 81 is 34, the least common denominator is 23 x 34 = 648.
What is the common denominator of 18 and 24?
A common denominator is 72.
What is the common denominator of 81 and 63?
the number 9
The least common denominator of 81 and 56?
4536
What is the common denominator of 24 and 21?
A common denominator, though not the least one, is 24*21 = 504.
What is a common denominator for 16 and 24?
A common denominator, though not the least one, is 16*24 = 384.
