Subtract 63/10 from 7/21
1st number: 7/21, 2nd number: 6 3/10
7/21 - 63/10 is -179/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
7/21 = 7 × 10/21 × 10 = 70/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
63/10 = 63 × 21/10 × 21 = 1323/210 - Subtract the two like fractions:
70/210 - 1323/210 = 70 - 1323/210 = -1253/210 - After reducing the fraction, the answer is -179/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-63/10 7/42-63/10 7/21-63/20 7/63-63/10 7/21-63/30 35/21-63/10 7/21-63/50 49/21-63/10 7/21-63/70