Subtract 30/21 from 45/3
1st number: 15 0/3, 2nd number: 1 9/21
45/3 - 30/21 is 95/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
45/3 = 45 × 7/3 × 7 = 315/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
30/21 = 30 × 1/21 × 1 = 30/21 - Subtract the two like fractions:
315/21 - 30/21 = 315 - 30/21 = 285/21 - After reducing the fraction, the answer is 95/7
- In mixed form: 134/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/3-30/21 45/3-60/21 45/6-30/21 45/3-30/42 45/3-90/21 45/9-30/21 45/3-30/63 45/15-30/21 45/21-30/21