Subtract 15/70 from 2/21
2/21 - 15/70 is -5/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
2/21 = 2 × 10/21 × 10 = 20/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
15/70 = 15 × 3/70 × 3 = 45/210 - Subtract the two like fractions:
20/210 - 45/210 = 20 - 45/210 = -25/210 - After reducing the fraction, the answer is -5/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-15/70 2/21-30/70 2/42-15/70 6/21-15/70 2/21-45/70 2/63-15/70 10/21-15/70 2/21-75/70 14/21-15/70