Subtract 21/98 from 4/70
4/70 - 21/98 is -11/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 98 is 490
Next, find the equivalent fraction of both fractional numbers with denominator 490 - For the 1st fraction, since 70 × 7 = 490,
4/70 = 4 × 7/70 × 7 = 28/490 - Likewise, for the 2nd fraction, since 98 × 5 = 490,
21/98 = 21 × 5/98 × 5 = 105/490 - Subtract the two like fractions:
28/490 - 105/490 = 28 - 105/490 = -77/490 - After reducing the fraction, the answer is -11/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/70-21/98 4/70-42/98 12/70-21/98 4/70-63/98 20/70-21/98 28/70-21/98