Subtract 30/21 from 6/15
1st number: 6/15, 2nd number: 1 9/21
6/15 - 30/21 is -36/35.
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,
6/15 = 6 × 7/15 × 7 = 42/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
30/21 = 30 × 5/21 × 5 = 150/105 - Subtract the two like fractions:
42/105 - 150/105 = 42 - 150/105 = -108/105 - After reducing the fraction, the answer is -36/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/15-30/21 6/15-60/21 6/30-30/21 6/15-30/42 18/15-30/21 6/15-90/21 6/45-30/21 6/15-30/63 30/15-30/21 6/75-30/21 42/15-30/21