Subtract 14/21 from 42/30
1st number: 1 12/30, 2nd number: 14/21
42/30 - 14/21 is 11/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
42/30 = 42 × 7/30 × 7 = 294/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
14/21 = 14 × 10/21 × 10 = 140/210 - Subtract the two like fractions:
294/210 - 140/210 = 294 - 140/210 = 154/210 - After reducing the fraction, the answer is 11/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30-14/21 42/30-28/21 42/60-14/21 42/30-14/42 42/30-42/21 42/90-14/21 42/30-14/63 42/30-70/21 42/30-98/21