LCD(9, 28) = 252
It is 180 which is also the LCM
36
48
The LCD of 20 and 9 is 180.
LCD(9, 15) = 45
LCD(9, 21) = 63
LCD(9, 36) = 36.
lcd(2, 6, 12) = 12.
LCD(12, 20) = 60
LCD(12, 8) = 24.
In adding dissimilar fractions first you have to find the LCD! -> LCD means Least Common Denominator. *For example 2/3 3 6 9 12 + 3/4 4 8 12 the LCD is 12 put 12 under the - divide 12 to denominator and write the answer in left of given question