Subtract 50/7 from 90/21
1st number: 4 6/21, 2nd number: 7 1/7
90/21 - 50/7 is -20/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
90/21 = 90 × 1/21 × 1 = 90/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
50/7 = 50 × 3/7 × 3 = 150/21 - Subtract the two like fractions:
90/21 - 150/21 = 90 - 150/21 = -60/21 - After reducing the fraction, the answer is -20/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42-50/7 90/21-50/14 90/63-50/7 90/21-50/21 90/21-50/35 90/21-50/49