Answers

Subtract 15/81 from 7/4

1^st number: 1 3/4, 2^nd number: 15/81

7/4 - 15/81 is 169/108.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 81 is 324
   
   Next, find the equivalent fraction of both fractional numbers with denominator 324
2. For the 1st fraction, since 4 × 81 = 324,
   7/4 = 7 × 81/4 × 81 = 567/324
3. Likewise, for the 2nd fraction, since 81 × 4 = 324,
   15/81 = 15 × 4/81 × 4 = 60/324
4. Subtract the two like fractions:
   567/324 - 60/324 = 567 - 60/324 = 507/324
5. After reducing the fraction, the answer is 169/108
6. In mixed form: 161/108

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