Subtract 21/45 from 18/49
18/49 - 21/45 is -73/735.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 45 is 2205
Next, find the equivalent fraction of both fractional numbers with denominator 2205 - For the 1st fraction, since 49 × 45 = 2205,
18/49 = 18 × 45/49 × 45 = 810/2205 - Likewise, for the 2nd fraction, since 45 × 49 = 2205,
21/45 = 21 × 49/45 × 49 = 1029/2205 - Subtract the two like fractions:
810/2205 - 1029/2205 = 810 - 1029/2205 = -219/2205 - After reducing the fraction, the answer is -73/735
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/49-21/45 18/49-42/45 18/98-21/45 18/49-21/90 54/49-21/45 18/49-63/45 90/49-21/45