Subtract 45/42 from 63/4, Solve 15 3/4

Subtract 45/42 from 63/4

1^st number: 15 3/4, 2^nd number: 1 3/42

63/4 - 45/42 is 411/28.

Find the least common denominator or LCM of the two denominators:
LCM of 4 and 42 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 4 × 21 = 84,
63/4 = 63 × 21/4 × 21 = 1323/84
Likewise, for the 2nd fraction, since 42 × 2 = 84,
45/42 = 45 × 2/42 × 2 = 90/84
Subtract the two like fractions:
1323/84 - 90/84 = 1323 - 90/84 = 1233/84
After reducing the fraction, the answer is 411/28
In mixed form: 1419/28

MathStep (Works offline)

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