12,24,36,48,60,72,84,96,108,120......204
17,34,51,68,85,102,119,136,153,170,187,204,
LCD for 12 and 17 is 204 (12X17=204)
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To compare the sizes of fractions, we need to find a common denominator. In this case, the least common multiple of 5 and 20 is 20. Converting four fifths to have a denominator of 20, we get 16/20. Comparing 16/20 to 17/20, we see that 17/20 is bigger than 16/20. Therefore, seventeen twentieths is bigger than four fifths.
The Least Common Multiple (LCM) for 13 17 is 221.
The highest or greatest common denominator of any two or more whole numbers, such as 7 and 17, will always be one (1) because 'common denominator' refers to the denominators of two or more fractions or mixed numbers, not whole numbers. So, a set of whole numbers (x,x) would have to be converted to their fraction equivalents, i.e., x/1, which will always yield a denominator of 1.
The least common multiple of 17 , 63 , 119 = 1,071
seventeen over fifteen because the common denominator of 5 and 3 is 15 think about it like this: 4/5x3, 4x3=12, 5x3=15 1/3x5, 1x5=5, 3x5=15 so you get 12/15+5/15 see how they simplify back? then add the numerators and keep the denominator and you get 17/15 or 1 and 2/15