Subtract 42/20 from 45/7
1st number: 6 3/7, 2nd number: 2 2/20
45/7 - 42/20 is 303/70.
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,
45/7 = 45 × 20/7 × 20 = 900/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
42/20 = 42 × 7/20 × 7 = 294/140 - Subtract the two like fractions:
900/140 - 294/140 = 900 - 294/140 = 606/140 - After reducing the fraction, the answer is 303/70
- In mixed form: 423/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/7-42/20 45/7-84/20 45/14-42/20 45/7-42/40 45/21-42/20 45/7-42/60 45/35-42/20 45/49-42/20