Subtract 30/45 from 21/3
1st number: 7 0/3, 2nd number: 30/45
21/3 - 30/45 is 19/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 45 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 3 × 15 = 45,
21/3 = 21 × 15/3 × 15 = 315/45 - Likewise, for the 2nd fraction, since 45 × 1 = 45,
30/45 = 30 × 1/45 × 1 = 30/45 - Subtract the two like fractions:
315/45 - 30/45 = 315 - 30/45 = 285/45 - After reducing the fraction, the answer is 19/3
- In mixed form: 61/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3-30/45 21/3-60/45 21/6-30/45 21/3-30/90 63/3-30/45 21/3-90/45 21/9-30/45 21/15-30/45