Answers

Subtract 21/80 from 9/49

9/49 - 21/80 is -309/3920.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 49 and 80 is 3920
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3920
2. For the 1st fraction, since 49 × 80 = 3920,
   9/49 = 9 × 80/49 × 80 = 720/3920
3. Likewise, for the 2nd fraction, since 80 × 49 = 3920,
   21/80 = 21 × 49/80 × 49 = 1029/3920
4. Subtract the two like fractions:
   720/3920 - 1029/3920 = 720 - 1029/3920 = -309/3920

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