Subtract 45/30 from 40/49, Solve 40/49

Subtract 45/30 from 40/49

1^st number: 40/49, 2^nd number: 1 15/30

40/49 - 45/30 is -67/98.

Find the least common denominator or LCM of the two denominators:
LCM of 49 and 30 is 1470

Next, find the equivalent fraction of both fractional numbers with denominator 1470
For the 1st fraction, since 49 × 30 = 1470,
40/49 = 40 × 30/49 × 30 = 1200/1470
Likewise, for the 2nd fraction, since 30 × 49 = 1470,
45/30 = 45 × 49/30 × 49 = 2205/1470
Subtract the two like fractions:
1200/1470 - 2205/1470 = 1200 - 2205/1470 = -1005/1470
After reducing the fraction, the answer is -67/98

MathStep (Works offline)

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