Answers

Subtract 7/81 from 18/5

1^st number: 3 3/5, 2^nd number: 7/81

18/5 - 7/81 is 1423/405.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 5 and 81 is 405
   
   Next, find the equivalent fraction of both fractional numbers with denominator 405
2. For the 1st fraction, since 5 × 81 = 405,
   18/5 = 18 × 81/5 × 81 = 1458/405
3. Likewise, for the 2nd fraction, since 81 × 5 = 405,
   7/81 = 7 × 5/81 × 5 = 35/405
4. Subtract the two like fractions:
   1458/405 - 35/405 = 1458 - 35/405 = 1423/405
5. In mixed form: 3208/405

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