Subtract 6/5 from 90/21, Solve 4 6/21

Subtract 6/5 from 90/21

1^st number: 4 6/21, 2^nd number: 1 1/5

90/21 - 6/5 is 108/35.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105

Next, find the equivalent fraction of both fractional numbers with denominator 105
For the 1st fraction, since 21 × 5 = 105,
90/21 = 90 × 5/21 × 5 = 450/105
Likewise, for the 2nd fraction, since 5 × 21 = 105,
6/5 = 6 × 21/5 × 21 = 126/105
Subtract the two like fractions:
450/105 - 126/105 = 450 - 126/105 = 324/105
After reducing the fraction, the answer is 108/35
In mixed form: 33/35

MathStep (Works offline)

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