Subtract 42/40 from 90/7
1st number: 12 6/7, 2nd number: 1 2/40
90/7 - 42/40 is 1653/140.
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,
42/40 = 42 × 7/40 × 7 = 294/280 - Subtract the two like fractions:
3600/280 - 294/280 = 3600 - 294/280 = 3306/280 - After reducing the fraction, the answer is 1653/140
- In mixed form: 11113/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/7-84/40 90/14-42/40 90/7-42/80 90/21-42/40 90/35-42/40 90/49-42/40