Subtract 45/84 from 12/45, Solve 12/45

Subtract 45/84 from 12/45

12/45 - 45/84 is -113/420.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 84 is 1260

Next, find the equivalent fraction of both fractional numbers with denominator 1260
For the 1st fraction, since 45 × 28 = 1260,
12/45 = 12 × 28/45 × 28 = 336/1260
Likewise, for the 2nd fraction, since 84 × 15 = 1260,
45/84 = 45 × 15/84 × 15 = 675/1260
Subtract the two like fractions:
336/1260 - 675/1260 = 336 - 675/1260 = -339/1260
After reducing the fraction, the answer is -113/420

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