Subtract 90/81 from 20/30
1st number: 20/30, 2nd number: 1 9/81
20/30 - 90/81 is -4/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 30 × 27 = 810,
20/30 = 20 × 27/30 × 27 = 540/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
90/81 = 90 × 10/81 × 10 = 900/810 - Subtract the two like fractions:
540/810 - 900/810 = 540 - 900/810 = -360/810 - After reducing the fraction, the answer is -4/9
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