Subtract 18/42 from 2/15
2/15 - 18/42 is -31/105.
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,
2/15 = 2 × 14/15 × 14 = 28/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
18/42 = 18 × 5/42 × 5 = 90/210 - Subtract the two like fractions:
28/210 - 90/210 = 28 - 90/210 = -62/210 - After reducing the fraction, the answer is -31/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/15-18/42 2/15-36/42 2/30-18/42 2/15-18/84 6/15-18/42 2/15-54/42 2/45-18/42 10/15-18/42 2/15-90/42 2/75-18/42 14/15-18/42