Answers

Subtract 48/81 from 21/36

21/36 - 48/81 is -1/108.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 36 and 81 is 324
   
   Next, find the equivalent fraction of both fractional numbers with denominator 324
2. For the 1st fraction, since 36 × 9 = 324,
   21/36 = 21 × 9/36 × 9 = 189/324
3. Likewise, for the 2nd fraction, since 81 × 4 = 324,
   48/81 = 48 × 4/81 × 4 = 192/324
4. Subtract the two like fractions:
   189/324 - 192/324 = 189 - 192/324 = -3/324
5. After reducing the fraction, the answer is -1/108

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