Subtract 18/70 from 20/98
20/98 - 18/70 is -13/245.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 98 and 70 is 490
Next, find the equivalent fraction of both fractional numbers with denominator 490 - For the 1st fraction, since 98 × 5 = 490,
20/98 = 20 × 5/98 × 5 = 100/490 - Likewise, for the 2nd fraction, since 70 × 7 = 490,
18/70 = 18 × 7/70 × 7 = 126/490 - Subtract the two like fractions:
100/490 - 126/490 = 100 - 126/490 = -26/490 - After reducing the fraction, the answer is -13/245
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/98-18/70 20/98-36/70 60/98-18/70 20/98-54/70 20/98-90/70