Answers

Subtract 20/63 from 21/98

21/98 - 20/63 is -13/126.

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,
   21/98 = 21 × 9/98 × 9 = 189/882
3. Likewise, for the 2nd fraction, since 63 × 14 = 882,
   20/63 = 20 × 14/63 × 14 = 280/882
4. Subtract the two like fractions:
   189/882 - 280/882 = 189 - 280/882 = -91/882
5. After reducing the fraction, the answer is -13/126

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