Answers

Subtract 90/18 from 54/15

1^st number: 3 9/15, 2^nd number: 5 0/18

54/15 - 90/18 is -7/5.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 18 is 90
   
   Next, find the equivalent fraction of both fractional numbers with denominator 90
2. For the 1st fraction, since 15 × 6 = 90,
   54/15 = 54 × 6/15 × 6 = 324/90
3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
   90/18 = 90 × 5/18 × 5 = 450/90
4. Subtract the two like fractions:
   324/90 - 450/90 = 324 - 450/90 = -126/90
5. After reducing the fraction, the answer is -7/5

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