Subtract 28/8 from 30/63, Solve 30/63

Subtract 28/8 from 30/63

1^st number: 30/63, 2^nd number: 3 4/8

30/63 - 28/8 is -127/42.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 8 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 63 × 8 = 504,
30/63 = 30 × 8/63 × 8 = 240/504
Likewise, for the 2nd fraction, since 8 × 63 = 504,
28/8 = 28 × 63/8 × 63 = 1764/504
Subtract the two like fractions:
240/504 - 1764/504 = 240 - 1764/504 = -1524/504
After reducing the fraction, the answer is -127/42

MathStep (Works offline)

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