Subtract 5/8 from 20/81
20/81 - 5/8 is -245/648.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 8 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 81 × 8 = 648,
20/81 = 20 × 8/81 × 8 = 160/648 - Likewise, for the 2nd fraction, since 8 × 81 = 648,
5/8 = 5 × 81/8 × 81 = 405/648 - Subtract the two like fractions:
160/648 - 405/648 = 160 - 405/648 = -245/648
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