Subtract 42/7 from 81/5, Solve 16 1/5

Subtract 42/7 from 81/5

1^st number: 16 1/5, 2^nd number: 6 0/7

81/5 - 42/7 is 51/5.

Find the least common denominator or LCM of the two denominators:
LCM of 5 and 7 is 35

Next, find the equivalent fraction of both fractional numbers with denominator 35
For the 1st fraction, since 5 × 7 = 35,
81/5 = 81 × 7/5 × 7 = 567/35
Likewise, for the 2nd fraction, since 7 × 5 = 35,
42/7 = 42 × 5/7 × 5 = 210/35
Subtract the two like fractions:
567/35 - 210/35 = 567 - 210/35 = 357/35
After reducing the fraction, the answer is 51/5
In mixed form: 101/5

MathStep (Works offline)

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