Subtract 45/9 from 7/21
1st number: 7/21, 2nd number: 5 0/9
7/21 - 45/9 is -14/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
7/21 = 7 × 3/21 × 3 = 21/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
45/9 = 45 × 7/9 × 7 = 315/63 - Subtract the two like fractions:
21/63 - 315/63 = 21 - 315/63 = -294/63 - After reducing the fraction, the answer is -14/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-45/9 7/21-90/9 7/42-45/9 7/21-45/18 7/63-45/9 7/21-45/27 35/21-45/9 49/21-45/9 7/21-45/63