Subtract 80/49 from 20/90
1st number: 20/90, 2nd number: 1 31/49
20/90 - 80/49 is -622/441.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 49 is 4410
Next, find the equivalent fraction of both fractional numbers with denominator 4410 - For the 1st fraction, since 90 × 49 = 4410,
20/90 = 20 × 49/90 × 49 = 980/4410 - Likewise, for the 2nd fraction, since 49 × 90 = 4410,
80/49 = 80 × 90/49 × 90 = 7200/4410 - Subtract the two like fractions:
980/4410 - 7200/4410 = 980 - 7200/4410 = -6220/4410 - After reducing the fraction, the answer is -622/441
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90-80/49 20/90-80/98 60/90-80/49