Answers

Subtract 20/63 from 7/98

7/98 - 20/63 is -31/126.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 98 and 63 is 882
   
   Next, find the equivalent fraction of both fractional numbers with denominator 882
2. For the 1st fraction, since 98 × 9 = 882,
   7/98 = 7 × 9/98 × 9 = 63/882
3. Likewise, for the 2nd fraction, since 63 × 14 = 882,
   20/63 = 20 × 14/63 × 14 = 280/882
4. Subtract the two like fractions:
   63/882 - 280/882 = 63 - 280/882 = -217/882
5. After reducing the fraction, the answer is -31/126

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