Answers

Subtract 81/12 from 28/30

1^st number: 28/30, 2^nd number: 6 9/12

28/30 - 81/12 is -349/60.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 30 and 12 is 60
   
   Next, find the equivalent fraction of both fractional numbers with denominator 60
2. For the 1st fraction, since 30 × 2 = 60,
   28/30 = 28 × 2/30 × 2 = 56/60
3. Likewise, for the 2nd fraction, since 12 × 5 = 60,
   81/12 = 81 × 5/12 × 5 = 405/60
4. Subtract the two like fractions:
   56/60 - 405/60 = 56 - 405/60 = -349/60

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁵⁶/₃₀-⁸¹/₁₂ ²⁸/₆₀-⁸¹/₁₂ ²⁸/₃₀-⁸¹/₂₄ ⁸⁴/₃₀-⁸¹/₁₂ ²⁸/₉₀-⁸¹/₁₂ ²⁸/₃₀-⁸¹/₃₆ ²⁸/₃₀-⁸¹/₆₀ ²⁸/₃₀-⁸¹/₈₄

Subtract Fractions Calculator