Answers

Subtract 15/7 from 12/42

1^st number: 12/42, 2^nd number: 2 1/7

12/42 - 15/7 is -13/7.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 7 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 42 × 1 = 42,
   12/42 = 12 × 1/42 × 1 = 12/42
3. Likewise, for the 2nd fraction, since 7 × 6 = 42,
   15/7 = 15 × 6/7 × 6 = 90/42
4. Subtract the two like fractions:
   12/42 - 90/42 = 12 - 90/42 = -78/42
5. After reducing the fraction, the answer is -13/7

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