simplest form 8/27/2013 | Reagan from Greenbrier, AR | 2 Answers | 0 Votes Mark favorite Subscribe Comment
5/8 - 9/20 Find common denominator: 40 convert fractions by multiplying numerators by same factor used to bring each denominator to 40. 25/40 - 18/40 = 7/40 8/27/2013 | Brenda W. Comment
5/8-9/20 (100-72)/160 28/160 14/80 7/40 is the simplest form as 7 is a prime number and 40 is not a multiple of 7. Given the sum or difference of any two fractions with different denominators a/b + c/d there is a formula for adding/subtracting them. It is (ad+bc)/bd 8/27/2013 | David A. Comment