Subtract 63/4 from 15/81
1st number: 15/81, 2nd number: 15 3/4
15/81 - 63/4 is -1681/108.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 4 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
15/81 = 15 × 4/81 × 4 = 60/324 - Likewise, for the 2nd fraction, since 4 × 81 = 324,
63/4 = 63 × 81/4 × 81 = 5103/324 - Subtract the two like fractions:
60/324 - 5103/324 = 60 - 5103/324 = -5043/324 - After reducing the fraction, the answer is -1681/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/81-63/4 15/81-63/8 45/81-63/4 15/81-63/12 75/81-63/4 15/81-63/20 15/81-63/28