Subtract 21/42 from 18/98
18/98 - 21/42 is -31/98.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 98 and 42 is 294
Next, find the equivalent fraction of both fractional numbers with denominator 294 - For the 1st fraction, since 98 × 3 = 294,
18/98 = 18 × 3/98 × 3 = 54/294 - Likewise, for the 2nd fraction, since 42 × 7 = 294,
21/42 = 21 × 7/42 × 7 = 147/294 - Subtract the two like fractions:
54/294 - 147/294 = 54 - 147/294 = -93/294 - After reducing the fraction, the answer is -31/98
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/98-21/42 18/98-21/84 54/98-21/42 18/98-63/42 90/98-21/42