Subtract 12/3 from 21/30
1st number: 21/30, 2nd number: 4 0/3
21/30 - 12/3 is -33/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 3 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 3 × 10 = 30,
12/3 = 12 × 10/3 × 10 = 120/30 - Subtract the two like fractions:
21/30 - 120/30 = 21 - 120/30 = -99/30 - After reducing the fraction, the answer is -33/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-12/3 21/30-24/3 21/60-12/3 21/30-12/6 63/30-12/3 21/30-36/3 21/90-12/3 21/30-12/9 21/30-60/3 21/30-12/15 21/30-84/3 21/30-12/21