Subtract 1/45 from 42/15, Solve 2 12/15

Subtract 1/45 from 42/15

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

42/15 - 1/45 is 25/9.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 45 is 45

Next, find the equivalent fraction of both fractional numbers with denominator 45
For the 1st fraction, since 15 × 3 = 45,
42/15 = 42 × 3/15 × 3 = 126/45
Likewise, for the 2nd fraction, since 45 × 1 = 45,
1/45 = 1 × 1/45 × 1 = 1/45
Subtract the two like fractions:
126/45 - 1/45 = 126 - 1/45 = 125/45
After reducing the fraction, the answer is 25/9
In mixed form: 27/9

MathStep (Works offline)

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