The Least Common Multiple is the multiple that is common to all four of the numbers.
The LCM of 4, 10, 2, and 9 is 180.
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20
20 is the lowest common denominator for 4 and 10.
2 Convert 1/2 to 2/4, then 4 will be the common denominator.
The Greatest Common Denominator is 2
A common denominator is 12.