Answers

Subtract 8/36 from 1/21

1/21 - 8/36 is -11/63.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 36 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 21 × 12 = 252,
   1/21 = 1 × 12/21 × 12 = 12/252
3. Likewise, for the 2nd fraction, since 36 × 7 = 252,
   8/36 = 8 × 7/36 × 7 = 56/252
4. Subtract the two like fractions:
   12/252 - 56/252 = 12 - 56/252 = -44/252
5. After reducing the fraction, the answer is -11/63

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