Subtract 80/98 from 30/90
30/90 - 80/98 is -71/147.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 98 is 4410
Next, find the equivalent fraction of both fractional numbers with denominator 4410 - For the 1st fraction, since 90 × 49 = 4410,
30/90 = 30 × 49/90 × 49 = 1470/4410 - Likewise, for the 2nd fraction, since 98 × 45 = 4410,
80/98 = 80 × 45/98 × 45 = 3600/4410 - Subtract the two like fractions:
1470/4410 - 3600/4410 = 1470 - 3600/4410 = -2130/4410 - After reducing the fraction, the answer is -71/147
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/90-80/98