Subtract 12/15 from 1/42
1/42 - 12/15 is -163/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 15 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
1/42 = 1 × 5/42 × 5 = 5/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
12/15 = 12 × 14/15 × 14 = 168/210 - Subtract the two like fractions:
5/210 - 168/210 = 5 - 168/210 = -163/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/42-12/15 1/42-24/15 1/84-12/15 1/42-12/30 3/42-12/15 1/42-36/15 1/42-12/45 5/42-12/15 1/42-60/15 1/42-12/75 7/42-12/15 1/42-84/15