Answers

Subtract 90/12 from 54/15

1^st number: 3 9/15, 2^nd number: 7 6/12

54/15 - 90/12 is -39/10.

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,
   54/15 = 54 × 4/15 × 4 = 216/60
3. Likewise, for the 2nd fraction, since 12 × 5 = 60,
   90/12 = 90 × 5/12 × 5 = 450/60
4. Subtract the two like fractions:
   216/60 - 450/60 = 216 - 450/60 = -234/60
5. After reducing the fraction, the answer is -39/10

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