Subtract 3/7 from 90/21
1st number: 4 6/21, 2nd number: 3/7
90/21 - 3/7 is 27/7.
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,
3/7 = 3 × 3/7 × 3 = 9/21 - Subtract the two like fractions:
90/21 - 9/21 = 90 - 9/21 = 81/21 - After reducing the fraction, the answer is 27/7
- In mixed form: 36/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-6/7 90/42-3/7 90/21-3/14 90/21-9/7 90/63-3/7 90/21-3/21 90/21-15/7 90/21-3/35 90/21-21/7 90/21-3/49