Answers

Subtract 20/45 from 25/63

25/63 - 20/45 is -1/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 45 is 315
   
   Next, find the equivalent fraction of both fractional numbers with denominator 315
2. For the 1st fraction, since 63 × 5 = 315,
   25/63 = 25 × 5/63 × 5 = 125/315
3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
   20/45 = 20 × 7/45 × 7 = 140/315
4. Subtract the two like fractions:
   125/315 - 140/315 = 125 - 140/315 = -15/315
5. After reducing the fraction, the answer is -1/21

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