Subtract 30/27 from 28/63, Solve 28/63

Subtract 30/27 from 28/63

1^st number: 28/63, 2^nd number: 1 3/27

28/63 - 30/27 is -2/3.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 27 is 189

Next, find the equivalent fraction of both fractional numbers with denominator 189
For the 1st fraction, since 63 × 3 = 189,
28/63 = 28 × 3/63 × 3 = 84/189
Likewise, for the 2nd fraction, since 27 × 7 = 189,
30/27 = 30 × 7/27 × 7 = 210/189
Subtract the two like fractions:
84/189 - 210/189 = 84 - 210/189 = -126/189
After reducing the fraction, the answer is -2/3

MathStep (Works offline)

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