Answers

Subtract 4/63 from 1/21

1/21 - 4/63 is -1/63.

Steps for subtracting fractions

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

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