168
LCD(9, 28) = 252
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.
LCD(6, 7) = 42
The least common denominator is 24.
The LCD is 56. The two have no common factors, so the LCD is their product, 7 x 8 =56
LCD(28, 56) = 56.
As 2 is a factor of 56, lcd(2, 56) = 56.
32 and 56 are the two numbers in question.
20 30 40 56
56565656
The LCD of 6, 5, and 7 is 210.
lcd(2, 6, 12) = 12.