Subtract 45/81 from 1/7, Solve 1/7

Subtract 45/81 from 1/7

1/7 - 45/81 is -26/63.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 81 is 567

Next, find the equivalent fraction of both fractional numbers with denominator 567
For the 1st fraction, since 7 × 81 = 567,
1/7 = 1 × 81/7 × 81 = 81/567
Likewise, for the 2nd fraction, since 81 × 7 = 567,
45/81 = 45 × 7/81 × 7 = 315/567
Subtract the two like fractions:
81/567 - 315/567 = 81 - 315/567 = -234/567
After reducing the fraction, the answer is -26/63

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