710 , 1720 , 1340

To find the LCD of a set of numbers (710,1720,1340), find the LCM of the denominators.

LCM(10,20,40)

Find the values of the numerical part of each term. Select the largest one, which in this case is 20. Multiply them together to get the current total. In this case, the current total is 200.

Current Total = 200

Check each value in the numerical part of each term against the current total. Since the current total is evenly divisible, return it. That is the least common denominator of the numerical part of the fraction.

20

20

Find the values of the numerical part of each term. Select the largest one, which in this case is 40. Multiply them together to get the current total. In this case, the current total is 800.

Current Total = 800

Check each value in the numerical part of each term against the current total. Since the current total is evenly divisible, return it. That is the least common denominator of the numerical part of the fraction.

40

40

Find the LCD 7/10 , 17/20 , 13/40