Answers

Subtract 9/21 from 63/64

63/64 - 9/21 is 249/448.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 64 and 21 is 1344
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1344
2. For the 1st fraction, since 64 × 21 = 1344,
   63/64 = 63 × 21/64 × 21 = 1323/1344
3. Likewise, for the 2nd fraction, since 21 × 64 = 1344,
   9/21 = 9 × 64/21 × 64 = 576/1344
4. Subtract the two like fractions:
   1323/1344 - 576/1344 = 1323 - 576/1344 = 747/1344
5. After reducing the fraction, the answer is 249/448

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