Answers

Subtract 42/80 from 18/98

18/98 - 42/80 is -669/1960.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 98 and 80 is 3920
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3920
2. For the 1st fraction, since 98 × 40 = 3920,
   18/98 = 18 × 40/98 × 40 = 720/3920
3. Likewise, for the 2nd fraction, since 80 × 49 = 3920,
   42/80 = 42 × 49/80 × 49 = 2058/3920
4. Subtract the two like fractions:
   720/3920 - 2058/3920 = 720 - 2058/3920 = -1338/3920
5. After reducing the fraction, the answer is -669/1960

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