Subtract 30/50 from 4/40, Solve 4/40

Subtract 30/50 from 4/40

4/40 - 30/50 is -1/2.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 50 is 200

Next, find the equivalent fraction of both fractional numbers with denominator 200
For the 1st fraction, since 40 × 5 = 200,
4/40 = 4 × 5/40 × 5 = 20/200
Likewise, for the 2nd fraction, since 50 × 4 = 200,
30/50 = 30 × 4/50 × 4 = 120/200
Subtract the two like fractions:
20/200 - 120/200 = 20 - 120/200 = -100/200
After reducing the fraction, the answer is -1/2

MathStep (Works offline)

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