Subtract 21/30 from 21/2
1st number: 10 1/2, 2nd number: 21/30
21/2 - 21/30 is 49/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 2 × 15 = 30,
21/2 = 21 × 15/2 × 15 = 315/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
21/30 = 21 × 1/30 × 1 = 21/30 - Subtract the two like fractions:
315/30 - 21/30 = 315 - 21/30 = 294/30 - After reducing the fraction, the answer is 49/5
- In mixed form: 94/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2-21/30 21/2-42/30 21/4-21/30 21/2-21/60 63/2-21/30 21/2-63/30 21/6-21/30 21/2-21/90 21/10-21/30 21/14-21/30