Subtract 30/8 from 4/84, Solve 4/84

Subtract 30/8 from 4/84

1^st number: 4/84, 2^nd number: 3 6/8

4/84 - 30/8 is -311/84.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 8 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 84 × 2 = 168,
4/84 = 4 × 2/84 × 2 = 8/168
Likewise, for the 2nd fraction, since 8 × 21 = 168,
30/8 = 30 × 21/8 × 21 = 630/168
Subtract the two like fractions:
8/168 - 630/168 = 8 - 630/168 = -622/168
After reducing the fraction, the answer is -311/84

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