Subtract 21/81 from 84/18
1st number: 4 12/18, 2nd number: 21/81
84/18 - 21/81 is 119/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 18 × 9 = 162,
84/18 = 84 × 9/18 × 9 = 756/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
21/81 = 21 × 2/81 × 2 = 42/162 - Subtract the two like fractions:
756/162 - 42/162 = 756 - 42/162 = 714/162 - After reducing the fraction, the answer is 119/27
- In mixed form: 411/27
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