Subtract 2/42 from 2/80, Solve 2/80

Subtract 2/42 from 2/80

2/80 - 2/42 is -19/840.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 42 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 80 × 21 = 1680,
2/80 = 2 × 21/80 × 21 = 42/1680
Likewise, for the 2nd fraction, since 42 × 40 = 1680,
2/42 = 2 × 40/42 × 40 = 80/1680
Subtract the two like fractions:
42/1680 - 80/1680 = 42 - 80/1680 = -38/1680
After reducing the fraction, the answer is -19/840

MathStep (Works offline)

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