Subtract 30/27 from 4/84, Solve 4/84

Subtract 30/27 from 4/84

1^st number: 4/84, 2^nd number: 1 3/27

4/84 - 30/27 is -67/63.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 27 is 756

Next, find the equivalent fraction of both fractional numbers with denominator 756
For the 1st fraction, since 84 × 9 = 756,
4/84 = 4 × 9/84 × 9 = 36/756
Likewise, for the 2nd fraction, since 27 × 28 = 756,
30/27 = 30 × 28/27 × 28 = 840/756
Subtract the two like fractions:
36/756 - 840/756 = 36 - 840/756 = -804/756
After reducing the fraction, the answer is -67/63

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