Answers

Subtract 81/28 from 84/30

1^st number: 2 24/30, 2^nd number: 2 25/28

84/30 - 81/28 is -13/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 30 and 28 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 30 × 14 = 420,
   84/30 = 84 × 14/30 × 14 = 1176/420
3. Likewise, for the 2nd fraction, since 28 × 15 = 420,
   81/28 = 81 × 15/28 × 15 = 1215/420
4. Subtract the two like fractions:
   1176/420 - 1215/420 = 1176 - 1215/420 = -39/420
5. After reducing the fraction, the answer is -13/140

MathStep (Works offline)

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

Related: ⁸⁴/₆₀-⁸¹/₂₈ ⁸⁴/₃₀-⁸¹/₅₆ ⁸⁴/₉₀-⁸¹/₂₈ ⁸⁴/₃₀-⁸¹/₈₄

Subtract Fractions Calculator