Answers

Subtract 45/12 from 20/15

1^st number: 1 5/15, 2^nd number: 3 9/12

20/15 - 45/12 is -29/12.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 12 is 60
   
   Next, find the equivalent fraction of both fractional numbers with denominator 60
2. For the 1st fraction, since 15 × 4 = 60,
   20/15 = 20 × 4/15 × 4 = 80/60
3. Likewise, for the 2nd fraction, since 12 × 5 = 60,
   45/12 = 45 × 5/12 × 5 = 225/60
4. Subtract the two like fractions:
   80/60 - 225/60 = 80 - 225/60 = -145/60
5. After reducing the fraction, the answer is -29/12

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