Answers

Subtract 63/12 from 42/80

1^st number: 42/80, 2^nd number: 5 3/12

42/80 - 63/12 is -189/40.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 12 is 240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 240
2. For the 1st fraction, since 80 × 3 = 240,
   42/80 = 42 × 3/80 × 3 = 126/240
3. Likewise, for the 2nd fraction, since 12 × 20 = 240,
   63/12 = 63 × 20/12 × 20 = 1260/240
4. Subtract the two like fractions:
   126/240 - 1260/240 = 126 - 1260/240 = -1134/240
5. After reducing the fraction, the answer is -189/40

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