Answers

Subtract 9/42 from 9/54

9/54 - 9/42 is -1/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 42 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 54 × 7 = 378,
   9/54 = 9 × 7/54 × 7 = 63/378
3. Likewise, for the 2nd fraction, since 42 × 9 = 378,
   9/42 = 9 × 9/42 × 9 = 81/378
4. Subtract the two like fractions:
   63/378 - 81/378 = 63 - 81/378 = -18/378
5. After reducing the fraction, the answer is -1/21

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