Answers

Subtract 42/10 from 12/81

1^st number: 12/81, 2^nd number: 4 2/10

12/81 - 42/10 is -547/135.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 10 is 810
   
   Next, find the equivalent fraction of both fractional numbers with denominator 810
2. For the 1st fraction, since 81 × 10 = 810,
   12/81 = 12 × 10/81 × 10 = 120/810
3. Likewise, for the 2nd fraction, since 10 × 81 = 810,
   42/10 = 42 × 81/10 × 81 = 3402/810
4. Subtract the two like fractions:
   120/810 - 3402/810 = 120 - 3402/810 = -3282/810
5. After reducing the fraction, the answer is -547/135

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