Subtract 1/8 from 42/81
42/81 - 1/8 is 85/216.
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,
42/81 = 42 × 8/81 × 8 = 336/648 - Likewise, for the 2nd fraction, since 8 × 81 = 648,
1/8 = 1 × 81/8 × 81 = 81/648 - Subtract the two like fractions:
336/648 - 81/648 = 336 - 81/648 = 255/648 - After reducing the fraction, the answer is 85/216
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