Answers

Subtract 90/8 from 28/10

1^st number: 2 8/10, 2^nd number: 11 2/8

28/10 - 90/8 is -169/20.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 10 and 8 is 40
   
   Next, find the equivalent fraction of both fractional numbers with denominator 40
2. For the 1st fraction, since 10 × 4 = 40,
   28/10 = 28 × 4/10 × 4 = 112/40
3. Likewise, for the 2nd fraction, since 8 × 5 = 40,
   90/8 = 90 × 5/8 × 5 = 450/40
4. Subtract the two like fractions:
   112/40 - 450/40 = 112 - 450/40 = -338/40
5. After reducing the fraction, the answer is -169/20

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