Answers

Subtract 28/20 from 75/90

1^st number: 75/90, 2^nd number: 1 8/20

75/90 - 28/20 is -17/30.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 20 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 90 × 2 = 180,
   75/90 = 75 × 2/90 × 2 = 150/180
3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
   28/20 = 28 × 9/20 × 9 = 252/180
4. Subtract the two like fractions:
   150/180 - 252/180 = 150 - 252/180 = -102/180
5. After reducing the fraction, the answer is -17/30

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