Subtract 90/10 from 20/7
1st number: 2 6/7, 2nd number: 9 0/10
20/7 - 90/10 is -43/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 10 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 7 × 10 = 70,
20/7 = 20 × 10/7 × 10 = 200/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
90/10 = 90 × 7/10 × 7 = 630/70 - Subtract the two like fractions:
200/70 - 630/70 = 200 - 630/70 = -430/70 - After reducing the fraction, the answer is -43/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/7-90/10 20/14-90/10 20/7-90/20 60/7-90/10 20/21-90/10 20/7-90/30 20/35-90/10 20/7-90/50 20/49-90/10 20/7-90/70