Subtract 1/21 from 15/70
15/70 - 1/21 is 1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
15/70 = 15 × 3/70 × 3 = 45/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
1/21 = 1 × 10/21 × 10 = 10/210 - Subtract the two like fractions:
45/210 - 10/210 = 45 - 10/210 = 35/210 - After reducing the fraction, the answer is 1/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/70-1/21 15/70-2/21 15/70-1/42 45/70-1/21 15/70-3/21 15/70-1/63 75/70-1/21 15/70-5/21 15/70-7/21