Subtract 42/27 from 12/45, Solve 12/45

Subtract 42/27 from 12/45

1^st number: 12/45, 2^nd number: 1 15/27

12/45 - 42/27 is -58/45.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 27 is 135

Next, find the equivalent fraction of both fractional numbers with denominator 135
For the 1st fraction, since 45 × 3 = 135,
12/45 = 12 × 3/45 × 3 = 36/135
Likewise, for the 2nd fraction, since 27 × 5 = 135,
42/27 = 42 × 5/27 × 5 = 210/135
Subtract the two like fractions:
36/135 - 210/135 = 36 - 210/135 = -174/135
After reducing the fraction, the answer is -58/45

MathStep (Works offline)

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