Subtract 90/70 from 28/75
1st number: 28/75, 2nd number: 1 20/70
28/75 - 90/70 is -479/525.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 70 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 75 × 14 = 1050,
28/75 = 28 × 14/75 × 14 = 392/1050 - Likewise, for the 2nd fraction, since 70 × 15 = 1050,
90/70 = 90 × 15/70 × 15 = 1350/1050 - Subtract the two like fractions:
392/1050 - 1350/1050 = 392 - 1350/1050 = -958/1050 - After reducing the fraction, the answer is -479/525
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/75-90/70 84/75-90/70