Subtract 28/45 from 7/70
7/70 - 28/45 is -47/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
7/70 = 7 × 9/70 × 9 = 63/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
28/45 = 28 × 14/45 × 14 = 392/630 - Subtract the two like fractions:
63/630 - 392/630 = 63 - 392/630 = -329/630 - After reducing the fraction, the answer is -47/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/70-28/45 7/70-56/45 7/70-28/90 21/70-28/45 7/70-84/45 35/70-28/45 49/70-28/45