Subtract 20/42 from 8/15
8/15 - 20/42 is 2/35.
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,
8/15 = 8 × 14/15 × 14 = 112/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
20/42 = 20 × 5/42 × 5 = 100/210 - Subtract the two like fractions:
112/210 - 100/210 = 112 - 100/210 = 12/210 - After reducing the fraction, the answer is 2/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15-20/42 8/15-40/42 8/30-20/42 8/15-20/84 24/15-20/42 8/15-60/42 8/45-20/42 40/15-20/42 8/75-20/42 56/15-20/42