Subtract 7/10 from 21/98
21/98 - 7/10 is -17/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 98 and 10 is 490
Next, find the equivalent fraction of both fractional numbers with denominator 490 - For the 1st fraction, since 98 × 5 = 490,
21/98 = 21 × 5/98 × 5 = 105/490 - Likewise, for the 2nd fraction, since 10 × 49 = 490,
7/10 = 7 × 49/10 × 49 = 343/490 - Subtract the two like fractions:
105/490 - 343/490 = 105 - 343/490 = -238/490 - After reducing the fraction, the answer is -17/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/98-7/10 21/98-14/10 21/98-7/20 63/98-7/10 21/98-21/10 21/98-7/30 21/98-35/10 21/98-7/50 21/98-49/10 21/98-7/70