72
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The lowest common multiple of 8 and 9 is 72.
The least common denominator of 8 and 9 is found by finding the multiples of each number so: Multiples of 8 = 8, 16, 24, 32, 40, 48, 56, 64, 72, 80 Multiples of 9 = 9, 18, 27, 36, 45, 54, 63, 72, 81, 90 Now look at your results and find the smallest number that is the same. 72 is the lowest, so that's is the least common denominator of 8 and 9
There is an infinite number of common denominators for these two fractions. The lowest common denominator is 45.
2, because when you simplify 4/8, you get 1/2, which has a 2 just like 2/9.
The factors of 8 are 1, 2, 4, and 8, and the factors of 9 are 1, 3, 9 so the common factor is 1.