Subtract 81/7 from 63/40
1st number: 1 23/40, 2nd number: 11 4/7
63/40 - 81/7 is -2799/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 7 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
63/40 = 63 × 7/40 × 7 = 441/280 - Likewise, for the 2nd fraction, since 7 × 40 = 280,
81/7 = 81 × 40/7 × 40 = 3240/280 - Subtract the two like fractions:
441/280 - 3240/280 = 441 - 3240/280 = -2799/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/80-81/7 63/40-81/14 63/40-81/21 63/40-81/35 63/40-81/49