Subtract 42/81 from 90/15
1st number: 6 0/15, 2nd number: 42/81
90/15 - 42/81 is 148/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 15 × 27 = 405,
90/15 = 90 × 27/15 × 27 = 2430/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
42/81 = 42 × 5/81 × 5 = 210/405 - Subtract the two like fractions:
2430/405 - 210/405 = 2430 - 210/405 = 2220/405 - After reducing the fraction, the answer is 148/27
- In mixed form: 513/27
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