Subtract 21/81 from 63/2
1st number: 31 1/2, 2nd number: 21/81
63/2 - 21/81 is 1687/54.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 2 × 81 = 162,
63/2 = 63 × 81/2 × 81 = 5103/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
21/81 = 21 × 2/81 × 2 = 42/162 - Subtract the two like fractions:
5103/162 - 42/162 = 5103 - 42/162 = 5061/162 - After reducing the fraction, the answer is 1687/54
- In mixed form: 3113/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/2-42/81 63/4-21/81 63/2-63/81 63/6-21/81 63/10-21/81 63/14-21/81