Subtract 21/45 from 9/28
9/28 - 21/45 is -61/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 45 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
9/28 = 9 × 45/28 × 45 = 405/1260 - Likewise, for the 2nd fraction, since 45 × 28 = 1260,
21/45 = 21 × 28/45 × 28 = 588/1260 - Subtract the two like fractions:
405/1260 - 588/1260 = 405 - 588/1260 = -183/1260 - After reducing the fraction, the answer is -61/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/28-21/45 9/28-42/45 9/56-21/45 9/28-21/90 27/28-21/45 9/28-63/45 9/84-21/45 45/28-21/45 63/28-21/45