Search 75,599 tutors
FIND TUTORS
Ask a question
0 0

5 divided by8 minus 9 divided by 20

Tutors, please sign in to answer this question.

2 Answers

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
 
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