Answers

Subtract 40/49 from 21/36

21/36 - 40/49 is -137/588.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 36 and 49 is 1764
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1764
2. For the 1st fraction, since 36 × 49 = 1764,
   21/36 = 21 × 49/36 × 49 = 1029/1764
3. Likewise, for the 2nd fraction, since 49 × 36 = 1764,
   40/49 = 40 × 36/49 × 36 = 1440/1764
4. Subtract the two like fractions:
   1029/1764 - 1440/1764 = 1029 - 1440/1764 = -411/1764
5. After reducing the fraction, the answer is -137/588

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