Subtract 21/9 from 90/21
1st number: 4 6/21, 2nd number: 2 3/9
90/21 - 21/9 is 41/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
90/21 = 90 × 3/21 × 3 = 270/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
21/9 = 21 × 7/9 × 7 = 147/63 - Subtract the two like fractions:
270/63 - 147/63 = 270 - 147/63 = 123/63 - After reducing the fraction, the answer is 41/21
- In mixed form: 120/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-42/9 90/42-21/9 90/21-21/18 90/21-63/9 90/63-21/9 90/21-21/27 90/21-21/45 90/21-21/63