Subtract 2/10 from 3/42
3/42 - 2/10 is -9/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
3/42 = 3 × 5/42 × 5 = 15/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
2/10 = 2 × 21/10 × 21 = 42/210 - Subtract the two like fractions:
15/210 - 42/210 = 15 - 42/210 = -27/210 - After reducing the fraction, the answer is -9/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42-2/10 3/42-4/10 3/84-2/10 3/42-2/20 9/42-2/10 3/42-6/10 3/42-2/30 15/42-2/10 3/42-2/50 21/42-2/10 3/42-14/10 3/42-2/70