Subtract 20/8 from 21/98
1st number: 21/98, 2nd number: 2 4/8
21/98 - 20/8 is -16/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 98 and 8 is 392
Next, find the equivalent fraction of both fractional numbers with denominator 392 - For the 1st fraction, since 98 × 4 = 392,
21/98 = 21 × 4/98 × 4 = 84/392 - Likewise, for the 2nd fraction, since 8 × 49 = 392,
20/8 = 20 × 49/8 × 49 = 980/392 - Subtract the two like fractions:
84/392 - 980/392 = 84 - 980/392 = -896/392 - After reducing the fraction, the answer is -16/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/98-20/8 21/98-40/8 21/98-20/16 63/98-20/8 21/98-60/8 21/98-20/24 21/98-20/40 21/98-20/56