Answers

Subtract 21/16 from 1/81

1^st number: 1/81, 2^nd number: 1 5/16

1/81 - 21/16 is -1685/1296.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 16 is 1296
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1296
2. For the 1st fraction, since 81 × 16 = 1296,
   1/81 = 1 × 16/81 × 16 = 16/1296
3. Likewise, for the 2nd fraction, since 16 × 81 = 1296,
   21/16 = 21 × 81/16 × 81 = 1701/1296
4. Subtract the two like fractions:
   16/1296 - 1701/1296 = 16 - 1701/1296 = -1685/1296

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