Subtract 2/4 from 28/81
28/81 - 2/4 is -25/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 4 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
28/81 = 28 × 4/81 × 4 = 112/324 - Likewise, for the 2nd fraction, since 4 × 81 = 324,
2/4 = 2 × 81/4 × 81 = 162/324 - Subtract the two like fractions:
112/324 - 162/324 = 112 - 162/324 = -50/324 - After reducing the fraction, the answer is -25/162
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