Answers

Subtract 80/49 from 21/20

1^st number: 1 1/20, 2^nd number: 1 31/49

21/20 - 80/49 is -571/980.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 49 is 980
   
   Next, find the equivalent fraction of both fractional numbers with denominator 980
2. For the 1st fraction, since 20 × 49 = 980,
   21/20 = 21 × 49/20 × 49 = 1029/980
3. Likewise, for the 2nd fraction, since 49 × 20 = 980,
   80/49 = 80 × 20/49 × 20 = 1600/980
4. Subtract the two like fractions:
   1029/980 - 1600/980 = 1029 - 1600/980 = -571/980

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