Subtract 30/21 from 35/15
1st number: 2 5/15, 2nd number: 1 9/21
35/15 - 30/21 is 19/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
35/15 = 35 × 7/15 × 7 = 245/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
30/21 = 30 × 5/21 × 5 = 150/105 - Subtract the two like fractions:
245/105 - 150/105 = 245 - 150/105 = 95/105 - After reducing the fraction, the answer is 19/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/15-30/21 35/15-60/21 35/30-30/21 35/15-30/42 35/15-90/21 35/45-30/21 35/15-30/63 35/75-30/21