To find a common denominator, it's what 4 and 7 go into, and that's 28.
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You Ned to find a larger common denominator or multiply the denominators to gain a common denominator.
you would want to find a common denominator -- in this case 160 is the largest common denominator 800/160=5 640/160=4 therefore the ratio would be 5:4 (said "5 to 4")
4/4
The easiest way to find a common denominator of two numbers is to multiply them. Therefore, one of the common denominators for 6 and 7 would be 42 (7 x 6). This method will not necessarily produce the lowest common denominator, but it will determine one. For example, multiplying 4 and 6 will give you 24 as a common denominator. However, the lowest common denominator for 4 and 6 is 12.
A common denominator, though not the least one, is 6*4 = 24.