Answers

Subtract 21/81 from 3/49

3/49 - 21/81 is -262/1323.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 49 and 81 is 3969
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3969
2. For the 1st fraction, since 49 × 81 = 3969,
   3/49 = 3 × 81/49 × 81 = 243/3969
3. Likewise, for the 2nd fraction, since 81 × 49 = 3969,
   21/81 = 21 × 49/81 × 49 = 1029/3969
4. Subtract the two like fractions:
   243/3969 - 1029/3969 = 243 - 1029/3969 = -786/3969
5. After reducing the fraction, the answer is -262/1323

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