Subtract 28/81 from 10/40
10/40 - 28/81 is -31/324.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 81 is 3240
Next, find the equivalent fraction of both fractional numbers with denominator 3240 - For the 1st fraction, since 40 × 81 = 3240,
10/40 = 10 × 81/40 × 81 = 810/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
28/81 = 28 × 40/81 × 40 = 1120/3240 - Subtract the two like fractions:
810/3240 - 1120/3240 = 810 - 1120/3240 = -310/3240 - After reducing the fraction, the answer is -31/324
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