Subtract 81/63 from 40/15
1st number: 2 10/15, 2nd number: 1 18/63
40/15 - 81/63 is 29/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 63 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 15 × 21 = 315,
40/15 = 40 × 21/15 × 21 = 840/315 - Likewise, for the 2nd fraction, since 63 × 5 = 315,
81/63 = 81 × 5/63 × 5 = 405/315 - Subtract the two like fractions:
840/315 - 405/315 = 840 - 405/315 = 435/315 - After reducing the fraction, the answer is 29/21
- In mixed form: 18/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/15-81/63 40/30-81/63 40/45-81/63 40/75-81/63