Subtract 1/20 from 28/7
1st number: 4 0/7, 2nd number: 1/20
28/7 - 1/20 is 79/20.
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,
28/7 = 28 × 20/7 × 20 = 560/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
1/20 = 1 × 7/20 × 7 = 7/140 - Subtract the two like fractions:
560/140 - 7/140 = 560 - 7/140 = 553/140 - After reducing the fraction, the answer is 79/20
- In mixed form: 319/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/7-1/20 28/7-2/20 28/14-1/20 28/7-1/40 84/7-1/20 28/7-3/20 28/21-1/20 28/7-1/60 28/7-5/20 28/35-1/20 28/7-7/20 28/49-1/20