56 is the lcd of 8 and 7. You can get this by multiplying 8x7. 8 and 7 have no common factors; that is why you multiply the two numbers to get the lcd.
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3/4 = 12/167/16 = 7/165/8 = 10/16
The LCD of any two (or more) of positive integers is 1
84
LCD(6, 7) = 42
The LCD for 8 and 10 is 40. To find it, list the multiples of both numbers. The first multiple that they have in common is the LCD.