Answers

Subtract 1/81 from 25/21

1^st number: 1 4/21, 2^nd number: 1/81

25/21 - 1/81 is 668/567.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 81 is 567
   
   Next, find the equivalent fraction of both fractional numbers with denominator 567
2. For the 1st fraction, since 21 × 27 = 567,
   25/21 = 25 × 27/21 × 27 = 675/567
3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
   1/81 = 1 × 7/81 × 7 = 7/567
4. Subtract the two like fractions:
   675/567 - 7/567 = 675 - 7/567 = 668/567
5. In mixed form: 1101/567

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