Answers

Subtract 25/42 from 21/50

21/50 - 25/42 is -92/525.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 50 and 42 is 1050
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1050
2. For the 1st fraction, since 50 × 21 = 1050,
   21/50 = 21 × 21/50 × 21 = 441/1050
3. Likewise, for the 2nd fraction, since 42 × 25 = 1050,
   25/42 = 25 × 25/42 × 25 = 625/1050
4. Subtract the two like fractions:
   441/1050 - 625/1050 = 441 - 625/1050 = -184/1050
5. After reducing the fraction, the answer is -92/525

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