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5 divided by8 minus 9 divided by 20

simplest form  

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Brenda W. | Success with stress free learning!Success with stress free learning!
4.8 4.8 (130 lesson ratings) (130)
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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
 
David A. | Devoted math and government tutorDevoted math and government tutor
4.6 4.6 (13 lesson ratings) (13)
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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