Answers

Subtract 63/16 from 21/63

1^st number: 21/63, 2^nd number: 3 15/16

21/63 - 63/16 is -173/48.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 16 is 1008
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1008
2. For the 1st fraction, since 63 × 16 = 1008,
   21/63 = 21 × 16/63 × 16 = 336/1008
3. Likewise, for the 2nd fraction, since 16 × 63 = 1008,
   63/16 = 63 × 63/16 × 63 = 3969/1008
4. Subtract the two like fractions:
   336/1008 - 3969/1008 = 336 - 3969/1008 = -3633/1008
5. After reducing the fraction, the answer is -173/48

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