Subtract 72/81 from 4/8
4/8 - 72/81 is -7/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 8 × 81 = 648,
4/8 = 4 × 81/8 × 81 = 324/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
72/81 = 72 × 8/81 × 8 = 576/648 - Subtract the two like fractions:
324/648 - 576/648 = 324 - 576/648 = -252/648 - After reducing the fraction, the answer is -7/18
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