Subtract 30/14 from 45/63, Solve 45/63

Subtract 30/14 from 45/63

1^st number: 45/63, 2^nd number: 2 2/14

45/63 - 30/14 is -10/7.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 14 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 63 × 2 = 126,
45/63 = 45 × 2/63 × 2 = 90/126
Likewise, for the 2nd fraction, since 14 × 9 = 126,
30/14 = 30 × 9/14 × 9 = 270/126
Subtract the two like fractions:
90/126 - 270/126 = 90 - 270/126 = -180/126
After reducing the fraction, the answer is -10/7

MathStep (Works offline)

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