Subtract 90/28 from 10/20
1st number: 10/20, 2nd number: 3 6/28
10/20 - 90/28 is -19/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
10/20 = 10 × 7/20 × 7 = 70/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
90/28 = 90 × 5/28 × 5 = 450/140 - Subtract the two like fractions:
70/140 - 450/140 = 70 - 450/140 = -380/140 - After reducing the fraction, the answer is -19/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/40-90/28 10/20-90/56 30/20-90/28 10/60-90/28 10/20-90/84 50/20-90/28 70/20-90/28