Subtract 20/49 from 1/90
1/90 - 20/49 is -1751/4410.
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,
1/90 = 1 × 49/90 × 49 = 49/4410 - Likewise, for the 2nd fraction, since 49 × 90 = 4410,
20/49 = 20 × 90/49 × 90 = 1800/4410 - Subtract the two like fractions:
49/4410 - 1800/4410 = 49 - 1800/4410 = -1751/4410
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/90-20/49 1/90-40/49 1/90-20/98 3/90-20/49 1/90-60/49 5/90-20/49 7/90-20/49