Answers

Subtract 42/20 from 72/98

1^st number: 72/98, 2^nd number: 2 2/20

72/98 - 42/20 is -669/490.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 98 and 20 is 980
   
   Next, find the equivalent fraction of both fractional numbers with denominator 980
2. For the 1st fraction, since 98 × 10 = 980,
   72/98 = 72 × 10/98 × 10 = 720/980
3. Likewise, for the 2nd fraction, since 20 × 49 = 980,
   42/20 = 42 × 49/20 × 49 = 2058/980
4. Subtract the two like fractions:
   720/980 - 2058/980 = 720 - 2058/980 = -1338/980
5. After reducing the fraction, the answer is -669/490

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