Subtract 42/81 from 12/30
12/30 - 42/81 is -16/135.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 30 × 27 = 810,
12/30 = 12 × 27/30 × 27 = 324/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
42/81 = 42 × 10/81 × 10 = 420/810 - Subtract the two like fractions:
324/810 - 420/810 = 324 - 420/810 = -96/810 - After reducing the fraction, the answer is -16/135
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