Answers

Subtract 84/4 from 1/80

1^st number: 1/80, 2^nd number: 21 0/4

1/80 - 84/4 is -1679/80.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 4 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 80 × 1 = 80,
   1/80 = 1 × 1/80 × 1 = 1/80
3. Likewise, for the 2nd fraction, since 4 × 20 = 80,
   84/4 = 84 × 20/4 × 20 = 1680/80
4. Subtract the two like fractions:
   1/80 - 1680/80 = 1 - 1680/80 = -1679/80

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