Subtract 28/12 from 45/27, Solve 1 18/27

Subtract 28/12 from 45/27

1^st number: 1 18/27, 2^nd number: 2 4/12

45/27 - 28/12 is -2/3.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 12 is 108

Next, find the equivalent fraction of both fractional numbers with denominator 108
For the 1st fraction, since 27 × 4 = 108,
45/27 = 45 × 4/27 × 4 = 180/108
Likewise, for the 2nd fraction, since 12 × 9 = 108,
28/12 = 28 × 9/12 × 9 = 252/108
Subtract the two like fractions:
180/108 - 252/108 = 180 - 252/108 = -72/108
After reducing the fraction, the answer is -2/3

MathStep (Works offline)

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