Subtract 42/20 from 5/7
1st number: 5/7, 2nd number: 2 2/20
5/7 - 42/20 is -97/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 7 × 20 = 140,
5/7 = 5 × 20/7 × 20 = 100/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
42/20 = 42 × 7/20 × 7 = 294/140 - Subtract the two like fractions:
100/140 - 294/140 = 100 - 294/140 = -194/140 - After reducing the fraction, the answer is -97/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/7-42/20 5/7-84/20 5/14-42/20 5/7-42/40 15/7-42/20 5/21-42/20 5/7-42/60 25/7-42/20 5/35-42/20 35/7-42/20 5/49-42/20