Answers

Subtract 28/15 from 9/80

1^st number: 9/80, 2^nd number: 1 13/15

9/80 - 28/15 is -421/240.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 15 is 240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 240
2. For the 1st fraction, since 80 × 3 = 240,
   9/80 = 9 × 3/80 × 3 = 27/240
3. Likewise, for the 2nd fraction, since 15 × 16 = 240,
   28/15 = 28 × 16/15 × 16 = 448/240
4. Subtract the two like fractions:
   27/240 - 448/240 = 27 - 448/240 = -421/240

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