Answers

Subtract 81/90 from 16/28

16/28 - 81/90 is -23/70.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 90 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 28 × 45 = 1260,
   16/28 = 16 × 45/28 × 45 = 720/1260
3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
   81/90 = 81 × 14/90 × 14 = 1134/1260
4. Subtract the two like fractions:
   720/1260 - 1134/1260 = 720 - 1134/1260 = -414/1260
5. After reducing the fraction, the answer is -23/70

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