Answers

Subtract 20/98 from 15/80

15/80 - 20/98 is -13/784.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 98 is 3920
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3920
2. For the 1st fraction, since 80 × 49 = 3920,
   15/80 = 15 × 49/80 × 49 = 735/3920
3. Likewise, for the 2nd fraction, since 98 × 40 = 3920,
   20/98 = 20 × 40/98 × 40 = 800/3920
4. Subtract the two like fractions:
   735/3920 - 800/3920 = 735 - 800/3920 = -65/3920
5. After reducing the fraction, the answer is -13/784

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