Subtract 12/10 from 21/30
1st number: 21/30, 2nd number: 1 2/10
21/30 - 12/10 is -1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 10 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 30 × 1 = 30,
21/30 = 21 × 1/30 × 1 = 21/30 - Likewise, for the 2nd fraction, since 10 × 3 = 30,
12/10 = 12 × 3/10 × 3 = 36/30 - Subtract the two like fractions:
21/30 - 36/30 = 21 - 36/30 = -15/30 - After reducing the fraction, the answer is -1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-12/10 21/30-24/10 21/60-12/10 21/30-12/20 63/30-12/10 21/30-36/10 21/90-12/10 21/30-12/30 21/30-60/10 21/30-12/50 21/30-84/10 21/30-12/70