Answers

Subtract 28/98 from 20/90

20/90 - 28/98 is -4/63.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 98 is 4410
   
   Next, find the equivalent fraction of both fractional numbers with denominator 4410
2. For the 1st fraction, since 90 × 49 = 4410,
   20/90 = 20 × 49/90 × 49 = 980/4410
3. Likewise, for the 2nd fraction, since 98 × 45 = 4410,
   28/98 = 28 × 45/98 × 45 = 1260/4410
4. Subtract the two like fractions:
   980/4410 - 1260/4410 = 980 - 1260/4410 = -280/4410
5. After reducing the fraction, the answer is -4/63

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