Answers

Subtract 70/18 from 80/42

1^st number: 1 38/42, 2^nd number: 3 16/18

80/42 - 70/18 is -125/63.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 18 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 42 × 3 = 126,
   80/42 = 80 × 3/42 × 3 = 240/126
3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
   70/18 = 70 × 7/18 × 7 = 490/126
4. Subtract the two like fractions:
   240/126 - 490/126 = 240 - 490/126 = -250/126
5. After reducing the fraction, the answer is -125/63

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