Subtract 6/90 from 4/84, Solve 4/84

Subtract 6/90 from 4/84

4/84 - 6/90 is -2/105.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 90 is 1260

Next, find the equivalent fraction of both fractional numbers with denominator 1260
For the 1st fraction, since 84 × 15 = 1260,
4/84 = 4 × 15/84 × 15 = 60/1260
Likewise, for the 2nd fraction, since 90 × 14 = 1260,
6/90 = 6 × 14/90 × 14 = 84/1260
Subtract the two like fractions:
60/1260 - 84/1260 = 60 - 84/1260 = -24/1260
After reducing the fraction, the answer is -2/105

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