Subtract 20/81 from 54/12
1st number: 4 6/12, 2nd number: 20/81
54/12 - 20/81 is 689/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 12 × 27 = 324,
54/12 = 54 × 27/12 × 27 = 1458/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
20/81 = 20 × 4/81 × 4 = 80/324 - Subtract the two like fractions:
1458/324 - 80/324 = 1458 - 80/324 = 1378/324 - After reducing the fraction, the answer is 689/162
- In mixed form: 441/162
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