Subtract 9/15 from 7/81
7/81 - 9/15 is -208/405.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 15 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
7/81 = 7 × 5/81 × 5 = 35/405 - Likewise, for the 2nd fraction, since 15 × 27 = 405,
9/15 = 9 × 27/15 × 27 = 243/405 - Subtract the two like fractions:
35/405 - 243/405 = 35 - 243/405 = -208/405
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