Subtract 90/42 from 36/5, Solve 7 1/5

Subtract 90/42 from 36/5

1^st number: 7 1/5, 2^nd number: 2 6/42

36/5 - 90/42 is 177/35.

Find the least common denominator or LCM of the two denominators:
LCM of 5 and 42 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 5 × 42 = 210,
36/5 = 36 × 42/5 × 42 = 1512/210
Likewise, for the 2nd fraction, since 42 × 5 = 210,
90/42 = 90 × 5/42 × 5 = 450/210
Subtract the two like fractions:
1512/210 - 450/210 = 1512 - 450/210 = 1062/210
After reducing the fraction, the answer is 177/35
In mixed form: 52/35

MathStep (Works offline)

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