Subtract 81/36 from 28/50, Solve 28/50

Subtract 81/36 from 28/50

1^st number: 28/50, 2^nd number: 2 9/36

28/50 - 81/36 is -169/100.

Find the least common denominator or LCM of the two denominators:
LCM of 50 and 36 is 900

Next, find the equivalent fraction of both fractional numbers with denominator 900
For the 1st fraction, since 50 × 18 = 900,
28/50 = 28 × 18/50 × 18 = 504/900
Likewise, for the 2nd fraction, since 36 × 25 = 900,
81/36 = 81 × 25/36 × 25 = 2025/900
Subtract the two like fractions:
504/900 - 2025/900 = 504 - 2025/900 = -1521/900
After reducing the fraction, the answer is -169/100

MathStep (Works offline)

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