Subtract 72/12 from 3/45, Solve 3/45

Subtract 72/12 from 3/45

1^st number: 3/45, 2^nd number: 6 0/12

3/45 - 72/12 is -89/15.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 12 is 180

Next, find the equivalent fraction of both fractional numbers with denominator 180
For the 1st fraction, since 45 × 4 = 180,
3/45 = 3 × 4/45 × 4 = 12/180
Likewise, for the 2nd fraction, since 12 × 15 = 180,
72/12 = 72 × 15/12 × 15 = 1080/180
Subtract the two like fractions:
12/180 - 1080/180 = 12 - 1080/180 = -1068/180
After reducing the fraction, the answer is -89/15

MathStep (Works offline)

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