Subtract 21/81 from 12/30
12/30 - 21/81 is 19/135.
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,
21/81 = 21 × 10/81 × 10 = 210/810 - Subtract the two like fractions:
324/810 - 210/810 = 324 - 210/810 = 114/810 - After reducing the fraction, the answer is 19/135
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