Subtract 28/21 from 4/45
1st number: 4/45, 2nd number: 1 7/21
4/45 - 28/21 is -56/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
4/45 = 4 × 7/45 × 7 = 28/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
28/21 = 28 × 15/21 × 15 = 420/315 - Subtract the two like fractions:
28/315 - 420/315 = 28 - 420/315 = -392/315 - After reducing the fraction, the answer is -56/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/45-28/21 4/45-56/21 4/90-28/21 4/45-28/42 12/45-28/21 4/45-84/21 4/45-28/63 20/45-28/21 28/45-28/21