Subtract 63/40 from 90/7
1st number: 12 6/7, 2nd number: 1 23/40
90/7 - 63/40 is 3159/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 7 × 40 = 280,
90/7 = 90 × 40/7 × 40 = 3600/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
63/40 = 63 × 7/40 × 7 = 441/280 - Subtract the two like fractions:
3600/280 - 441/280 = 3600 - 441/280 = 3159/280 - In mixed form: 1179/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/14-63/40 90/7-63/80 90/21-63/40 90/35-63/40 90/49-63/40