Subtract 20/42 from 4/15
4/15 - 20/42 is -22/105.
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,
4/15 = 4 × 14/15 × 14 = 56/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
20/42 = 20 × 5/42 × 5 = 100/210 - Subtract the two like fractions:
56/210 - 100/210 = 56 - 100/210 = -44/210 - After reducing the fraction, the answer is -22/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/15-20/42 4/15-40/42 4/30-20/42 4/15-20/84 12/15-20/42 4/15-60/42 4/45-20/42 20/15-20/42 4/75-20/42 28/15-20/42