Answers

Subtract 21/40 from 8/98

8/98 - 21/40 is -869/1960.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 98 and 40 is 1960
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1960
2. For the 1st fraction, since 98 × 20 = 1960,
   8/98 = 8 × 20/98 × 20 = 160/1960
3. Likewise, for the 2nd fraction, since 40 × 49 = 1960,
   21/40 = 21 × 49/40 × 49 = 1029/1960
4. Subtract the two like fractions:
   160/1960 - 1029/1960 = 160 - 1029/1960 = -869/1960

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