Subtract 28/90 from 7/49
7/49 - 28/90 is -53/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 90 is 4410
Next, find the equivalent fraction of both fractional numbers with denominator 4410 - For the 1st fraction, since 49 × 90 = 4410,
7/49 = 7 × 90/49 × 90 = 630/4410 - Likewise, for the 2nd fraction, since 90 × 49 = 4410,
28/90 = 28 × 49/90 × 49 = 1372/4410 - Subtract the two like fractions:
630/4410 - 1372/4410 = 630 - 1372/4410 = -742/4410 - After reducing the fraction, the answer is -53/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/49-28/90 7/49-56/90 7/98-28/90 21/49-28/90 7/49-84/90 35/49-28/90