Subtract 8/15 from 9/42
9/42 - 8/15 is -67/210.
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,
9/42 = 9 × 5/42 × 5 = 45/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
8/15 = 8 × 14/15 × 14 = 112/210 - Subtract the two like fractions:
45/210 - 112/210 = 45 - 112/210 = -67/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/42-8/15 9/42-16/15 9/84-8/15 9/42-8/30 27/42-8/15 9/42-24/15 9/42-8/45 45/42-8/15 9/42-40/15 9/42-8/75 63/42-8/15 9/42-56/15