Answers

Subtract 7/8 from 20/63

20/63 - 7/8 is -281/504.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 8 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 63 × 8 = 504,
   20/63 = 20 × 8/63 × 8 = 160/504
3. Likewise, for the 2nd fraction, since 8 × 63 = 504,
   7/8 = 7 × 63/8 × 63 = 441/504
4. Subtract the two like fractions:
   160/504 - 441/504 = 160 - 441/504 = -281/504

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