Answers

Subtract 25/42 from 3/20

3/20 - 25/42 is -187/420.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 42 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 20 × 21 = 420,
   3/20 = 3 × 21/20 × 21 = 63/420
3. Likewise, for the 2nd fraction, since 42 × 10 = 420,
   25/42 = 25 × 10/42 × 10 = 250/420
4. Subtract the two like fractions:
   63/420 - 250/420 = 63 - 250/420 = -187/420

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