Answers

Subtract 1/81 from 21/3

1^st number: 7 0/3, 2^nd number: 1/81

21/3 - 1/81 is 566/81.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 3 and 81 is 81
   
   Next, find the equivalent fraction of both fractional numbers with denominator 81
2. For the 1st fraction, since 3 × 27 = 81,
   21/3 = 21 × 27/3 × 27 = 567/81
3. Likewise, for the 2nd fraction, since 81 × 1 = 81,
   1/81 = 1 × 1/81 × 1 = 1/81
4. Subtract the two like fractions:
   567/81 - 1/81 = 567 - 1/81 = 566/81
5. In mixed form: 680/81

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