Subtract 9/21 from 30/35
30/35 - 9/21 is 3/7.
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,
30/35 = 30 × 3/35 × 3 = 90/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
9/21 = 9 × 5/21 × 5 = 45/105 - Subtract the two like fractions:
90/105 - 45/105 = 90 - 45/105 = 45/105 - After reducing the fraction, the answer is 3/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/35-9/21 30/35-18/21 30/70-9/21 30/35-9/42 90/35-9/21 30/35-27/21 30/35-9/63 30/35-45/21 30/35-63/21