Subtract 9/21 from 90/35
1st number: 2 20/35, 2nd number: 9/21
90/35 - 9/21 is 15/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 35 × 3 = 105,
90/35 = 90 × 3/35 × 3 = 270/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
9/21 = 9 × 5/21 × 5 = 45/105 - Subtract the two like fractions:
270/105 - 45/105 = 270 - 45/105 = 225/105 - After reducing the fraction, the answer is 15/7
- In mixed form: 21/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/35-18/21 90/70-9/21 90/35-9/42 90/35-27/21 90/35-9/63 90/35-45/21 90/35-63/21