Answers

Subtract 40/49 from 21/54

21/54 - 40/49 is -377/882.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 49 is 2646
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2646
2. For the 1st fraction, since 54 × 49 = 2646,
   21/54 = 21 × 49/54 × 49 = 1029/2646
3. Likewise, for the 2nd fraction, since 49 × 54 = 2646,
   40/49 = 40 × 54/49 × 54 = 2160/2646
4. Subtract the two like fractions:
   1029/2646 - 2160/2646 = 1029 - 2160/2646 = -1131/2646
5. After reducing the fraction, the answer is -377/882

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