Subtract 42/81 from 45/18
1st number: 2 9/18, 2nd number: 42/81
45/18 - 42/81 is 107/54.
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,
45/18 = 45 × 9/18 × 9 = 405/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
42/81 = 42 × 2/81 × 2 = 84/162 - Subtract the two like fractions:
405/162 - 84/162 = 405 - 84/162 = 321/162 - After reducing the fraction, the answer is 107/54
- In mixed form: 153/54
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