Subtract 70/80 from 1/49, Solve 1/49

Subtract 70/80 from 1/49

1/49 - 70/80 is -335/392.

Find the least common denominator or LCM of the two denominators:
LCM of 49 and 80 is 3920

Next, find the equivalent fraction of both fractional numbers with denominator 3920
For the 1st fraction, since 49 × 80 = 3920,
1/49 = 1 × 80/49 × 80 = 80/3920
Likewise, for the 2nd fraction, since 80 × 49 = 3920,
70/80 = 70 × 49/80 × 49 = 3430/3920
Subtract the two like fractions:
80/3920 - 3430/3920 = 80 - 3430/3920 = -3350/3920
After reducing the fraction, the answer is -335/392

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad