Subtract 42/27 from 40/16, Solve 2 8/16

Subtract 42/27 from 40/16

1^st number: 2 8/16, 2^nd number: 1 15/27

40/16 - 42/27 is 17/18.

Find the least common denominator or LCM of the two denominators:
LCM of 16 and 27 is 432

Next, find the equivalent fraction of both fractional numbers with denominator 432
For the 1st fraction, since 16 × 27 = 432,
40/16 = 40 × 27/16 × 27 = 1080/432
Likewise, for the 2nd fraction, since 27 × 16 = 432,
42/27 = 42 × 16/27 × 16 = 672/432
Subtract the two like fractions:
1080/432 - 672/432 = 1080 - 672/432 = 408/432
After reducing the fraction, the answer is 17/18

MathStep (Works offline)

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