Quantitative Methods - Unit 1 > Fractions
 
 

Rules for Subtracting Fractions
 

  • If there are any mixed numbers convert them into improper fractions.
  • Find a common denominator (lowest common multiple).
  • Change the numerators in the same ratio as the denominators i.e. whatever you did to the bottom do the same to the top.
  • Subtract the numerators.
  • Keep the denominator the same.
  • Convert to a mixed number if necessary.