Subtract 15/7 from 42/3, Solve 14 0/3

Subtract 15/7 from 42/3

1^st number: 14 0/3, 2^nd number: 2 1/7

42/3 - 15/7 is 83/7.

Find the least common denominator or LCM of the two denominators:
LCM of 3 and 7 is 21

Next, find the equivalent fraction of both fractional numbers with denominator 21
For the 1st fraction, since 3 × 7 = 21,
42/3 = 42 × 7/3 × 7 = 294/21
Likewise, for the 2nd fraction, since 7 × 3 = 21,
15/7 = 15 × 3/7 × 3 = 45/21
Subtract the two like fractions:
294/21 - 45/21 = 294 - 45/21 = 249/21
After reducing the fraction, the answer is 83/7
In mixed form: 116/7

MathStep (Works offline)

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