Subtract 30/81 from 8/90
8/90 - 30/81 is -38/135.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 90 × 9 = 810,
8/90 = 8 × 9/90 × 9 = 72/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
30/81 = 30 × 10/81 × 10 = 300/810 - Subtract the two like fractions:
72/810 - 300/810 = 72 - 300/810 = -228/810 - After reducing the fraction, the answer is -38/135
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