Subtract 14/30 from 42/21
1st number: 2 0/21, 2nd number: 14/30
42/21 - 14/30 is 23/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
42/21 = 42 × 10/21 × 10 = 420/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
14/30 = 14 × 7/30 × 7 = 98/210 - Subtract the two like fractions:
420/210 - 98/210 = 420 - 98/210 = 322/210 - After reducing the fraction, the answer is 23/15
- In mixed form: 18/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-14/30 42/21-28/30 42/21-14/60 42/21-42/30 42/63-14/30 42/21-14/90 42/21-70/30 42/21-98/30