Subtract 7/81 from 42/48
42/48 - 7/81 is 511/648.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 81 is 1296
Next, find the equivalent fraction of both fractional numbers with denominator 1296 - For the 1st fraction, since 48 × 27 = 1296,
42/48 = 42 × 27/48 × 27 = 1134/1296 - Likewise, for the 2nd fraction, since 81 × 16 = 1296,
7/81 = 7 × 16/81 × 16 = 112/1296 - Subtract the two like fractions:
1134/1296 - 112/1296 = 1134 - 112/1296 = 1022/1296 - After reducing the fraction, the answer is 511/648
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