Subtract 28/18 from 15/70
1st number: 15/70, 2nd number: 1 10/18
15/70 - 28/18 is -169/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 18 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
15/70 = 15 × 9/70 × 9 = 135/630 - Likewise, for the 2nd fraction, since 18 × 35 = 630,
28/18 = 28 × 35/18 × 35 = 980/630 - Subtract the two like fractions:
135/630 - 980/630 = 135 - 980/630 = -845/630 - After reducing the fraction, the answer is -169/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/70-28/18 15/70-56/18 15/70-28/36 45/70-28/18 15/70-84/18 15/70-28/54 75/70-28/18 15/70-28/90