Subtract 9/25 from 90/12, Solve 7 6/12

Subtract 9/25 from 90/12

1^st number: 7 6/12, 2^nd number: 9/25

90/12 - 9/25 is 357/50.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 25 is 300

Next, find the equivalent fraction of both fractional numbers with denominator 300
For the 1st fraction, since 12 × 25 = 300,
90/12 = 90 × 25/12 × 25 = 2250/300
Likewise, for the 2nd fraction, since 25 × 12 = 300,
9/25 = 9 × 12/25 × 12 = 108/300
Subtract the two like fractions:
2250/300 - 108/300 = 2250 - 108/300 = 2142/300
After reducing the fraction, the answer is 357/50
In mixed form: 77/50

MathStep (Works offline)

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