SOLUTION: Hello I have been stuck on this all yesterday and today I sent in the question to a tutor but nothing back I know that i'm not the only one needing help. here's the trouble 21 7/9

Algebra ->  Numeric Fractions Calculators, Lesson and Practice -> SOLUTION: Hello I have been stuck on this all yesterday and today I sent in the question to a tutor but nothing back I know that i'm not the only one needing help. here's the trouble 21 7/9      Log On


   

Question 833860: Hello I have been stuck on this all yesterday and today I sent in the question to a tutor but nothing back I know that i'm not the only one needing help. here's the trouble 21 7/9 - 9 13/15 = need to find the exact for the answer thanks for all the help.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
you have two fractions with different denominators.
you need to find a common denominator
9=3*3
15=3*5
45=3*3*5
7*5=35
3*13=39
35/45=7/9
39/45=13/15
39 is greater than 35
borrow 4
20 +45/45+35/45
9 39/45
11 41/45