Because these are all prime numbers, the LCD will be 1. It'll also be the GCF.
Three fourths, two fourths, three fourths.
2
20
40 is the LCD.
3/4 = 12/167/16 = 7/165/8 = 10/16
288
The LCD of 3/4 and 7/9 is 36.
48
24
The numbers are coprime so their LCD is their product which is 7*5*2 = 70
40
The LCD is 20