Subtract 9/21 from 90/28
1st number: 3 6/28, 2nd number: 9/21
90/28 - 9/21 is 39/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
90/28 = 90 × 3/28 × 3 = 270/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
9/21 = 9 × 4/21 × 4 = 36/84 - Subtract the two like fractions:
270/84 - 36/84 = 270 - 36/84 = 234/84 - After reducing the fraction, the answer is 39/14
- In mixed form: 211/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/28-18/21 90/56-9/21 90/28-9/42 90/28-27/21 90/84-9/21 90/28-9/63 90/28-45/21 90/28-63/21