Subtract 4/42 from 21/15
1st number: 1 6/15, 2nd number: 4/42
21/15 - 4/42 is 137/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
21/15 = 21 × 14/15 × 14 = 294/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
4/42 = 4 × 5/42 × 5 = 20/210 - Subtract the two like fractions:
294/210 - 20/210 = 294 - 20/210 = 274/210 - After reducing the fraction, the answer is 137/105
- In mixed form: 132/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-4/42 21/15-8/42 21/30-4/42 21/15-4/84 63/15-4/42 21/15-12/42 21/45-4/42 21/15-20/42 21/75-4/42 21/15-28/42