Subtract 28/42 from 5/81
5/81 - 28/42 is -49/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 42 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 81 × 14 = 1134,
5/81 = 5 × 14/81 × 14 = 70/1134 - Likewise, for the 2nd fraction, since 42 × 27 = 1134,
28/42 = 28 × 27/42 × 27 = 756/1134 - Subtract the two like fractions:
70/1134 - 756/1134 = 70 - 756/1134 = -686/1134 - After reducing the fraction, the answer is -49/81
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