Answers

Subtract 63/49 from 21/81

1^st number: 21/81, 2^nd number: 1 14/49

21/81 - 63/49 is -194/189.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 49 is 3969
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3969
2. For the 1st fraction, since 81 × 49 = 3969,
   21/81 = 21 × 49/81 × 49 = 1029/3969
3. Likewise, for the 2nd fraction, since 49 × 81 = 3969,
   63/49 = 63 × 81/49 × 81 = 5103/3969
4. Subtract the two like fractions:
   1029/3969 - 5103/3969 = 1029 - 5103/3969 = -4074/3969
5. After reducing the fraction, the answer is -194/189

MathStep (Works offline)

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

Related: ⁴²/₈₁-⁶³/₄₉ ²¹/₈₁-⁶³/₉₈ ⁶³/₈₁-⁶³/₄₉

Subtract Fractions Calculator