The LCD of 7/8 and 1/3 is 24.
Which you don't want. You want the least common denominator, which is 360.
280
20
Somone put 30, but seven doesnt go into it
The LCD of 3/4 and 7/9 is 36.
24
the common denominator for 9/8 and 7/20 is 40. (45/40 and 14/40)
8
16 is the common denominator. 3/4=12/16 7/16=7/16 5/8=10/16
Which you don't want. You want the least common denominator, which is 360.
Just do the usual steps to add fractions. First, find the common denominator (8, in this case). Second, convert both fractions to the common denominator. Third, add the numerators.
1/2+3/8=7/8 -lover of math geeks ;) the common denominator is eight, so one half is converted into four eights. Then, three eighths plus four eighths is seven eighthts, so your answer is seven eighths. - A math geek
168.
8
280
It is 48
20