Answers

Subtract 25/63 from 3/40

3/40 - 25/63 is -811/2520.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 63 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 40 × 63 = 2520,
   3/40 = 3 × 63/40 × 63 = 189/2520
3. Likewise, for the 2nd fraction, since 63 × 40 = 2520,
   25/63 = 25 × 40/63 × 40 = 1000/2520
4. Subtract the two like fractions:
   189/2520 - 1000/2520 = 189 - 1000/2520 = -811/2520

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