Answers

Subtract 45/12 from 42/54

1^st number: 42/54, 2^nd number: 3 9/12

42/54 - 45/12 is -107/36.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 12 is 108
   
   Next, find the equivalent fraction of both fractional numbers with denominator 108
2. For the 1st fraction, since 54 × 2 = 108,
   42/54 = 42 × 2/54 × 2 = 84/108
3. Likewise, for the 2nd fraction, since 12 × 9 = 108,
   45/12 = 45 × 9/12 × 9 = 405/108
4. Subtract the two like fractions:
   84/108 - 405/108 = 84 - 405/108 = -321/108
5. After reducing the fraction, the answer is -107/36

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