Subtract 21/10 from 12/21
1st number: 12/21, 2nd number: 2 1/10
12/21 - 21/10 is -107/70.
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,
12/21 = 12 × 10/21 × 10 = 120/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
21/10 = 21 × 21/10 × 21 = 441/210 - Subtract the two like fractions:
120/210 - 441/210 = 120 - 441/210 = -321/210 - After reducing the fraction, the answer is -107/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-21/10 12/21-42/10 12/42-21/10 12/21-21/20 36/21-21/10 12/21-63/10 12/63-21/10 12/21-21/30 60/21-21/10 12/21-21/50 84/21-21/10 12/21-21/70