Answers

Subtract 21/40 from 4/63

4/63 - 21/40 is -1163/2520.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 40 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 63 × 40 = 2520,
   4/63 = 4 × 40/63 × 40 = 160/2520
3. Likewise, for the 2nd fraction, since 40 × 63 = 2520,
   21/40 = 21 × 63/40 × 63 = 1323/2520
4. Subtract the two like fractions:
   160/2520 - 1323/2520 = 160 - 1323/2520 = -1163/2520

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