Subtract 45/18 from 4/21
1st number: 4/21, 2nd number: 2 9/18
4/21 - 45/18 is -97/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
4/21 = 4 × 6/21 × 6 = 24/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
45/18 = 45 × 7/18 × 7 = 315/126 - Subtract the two like fractions:
24/126 - 315/126 = 24 - 315/126 = -291/126 - After reducing the fraction, the answer is -97/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-45/18 4/21-90/18 4/42-45/18 4/21-45/36 12/21-45/18 4/63-45/18 4/21-45/54 20/21-45/18 4/21-45/90 28/21-45/18