Subtract 70/7 from 28/20
1st number: 1 8/20, 2nd number: 10 0/7
28/20 - 70/7 is -43/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
28/20 = 28 × 7/20 × 7 = 196/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
70/7 = 70 × 20/7 × 20 = 1400/140 - Subtract the two like fractions:
196/140 - 1400/140 = 196 - 1400/140 = -1204/140 - After reducing the fraction, the answer is -43/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/20-70/7 28/40-70/7 28/20-70/14 84/20-70/7 28/60-70/7 28/20-70/21 28/20-70/35 28/20-70/49