Subtract 21/3 from 21/70
1st number: 21/70, 2nd number: 7 0/3
21/70 - 21/3 is -67/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 3 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210 - Likewise, for the 2nd fraction, since 3 × 70 = 210,
21/3 = 21 × 70/3 × 70 = 1470/210 - Subtract the two like fractions:
63/210 - 1470/210 = 63 - 1470/210 = -1407/210 - After reducing the fraction, the answer is -67/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70-21/3 21/70-42/3 21/70-21/6 63/70-21/3 21/70-63/3 21/70-21/9 21/70-21/15