Answers

Subtract 8/21 from 25/2

1^st number: 12 1/2, 2^nd number: 8/21

25/2 - 8/21 is 509/42.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 2 and 21 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 2 × 21 = 42,
   25/2 = 25 × 21/2 × 21 = 525/42
3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
   8/21 = 8 × 2/21 × 2 = 16/42
4. Subtract the two like fractions:
   525/42 - 16/42 = 525 - 16/42 = 509/42
5. In mixed form: 125/42

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