Answers

Subtract 7/81 from 42/10

1^st number: 4 2/10, 2^nd number: 7/81

42/10 - 7/81 is 1666/405.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 10 and 81 is 810
   
   Next, find the equivalent fraction of both fractional numbers with denominator 810
2. For the 1st fraction, since 10 × 81 = 810,
   42/10 = 42 × 81/10 × 81 = 3402/810
3. Likewise, for the 2nd fraction, since 81 × 10 = 810,
   7/81 = 7 × 10/81 × 10 = 70/810
4. Subtract the two like fractions:
   3402/810 - 70/810 = 3402 - 70/810 = 3332/810
5. After reducing the fraction, the answer is 1666/405
6. In mixed form: 446/405

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