Subtract 90/16 from 7/45, Solve 7/45

Subtract 90/16 from 7/45

1^st number: 7/45, 2^nd number: 5 10/16

7/45 - 90/16 is -1969/360.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 16 is 720

Next, find the equivalent fraction of both fractional numbers with denominator 720
For the 1st fraction, since 45 × 16 = 720,
7/45 = 7 × 16/45 × 16 = 112/720
Likewise, for the 2nd fraction, since 16 × 45 = 720,
90/16 = 90 × 45/16 × 45 = 4050/720
Subtract the two like fractions:
112/720 - 4050/720 = 112 - 4050/720 = -3938/720
After reducing the fraction, the answer is -1969/360

MathStep (Works offline)

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