Answers

Subtract 21/80 from 28/27

1^st number: 1 1/27, 2^nd number: 21/80

28/27 - 21/80 is 1673/2160.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 27 and 80 is 2160
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2160
2. For the 1st fraction, since 27 × 80 = 2160,
   28/27 = 28 × 80/27 × 80 = 2240/2160
3. Likewise, for the 2nd fraction, since 80 × 27 = 2160,
   21/80 = 21 × 27/80 × 27 = 567/2160
4. Subtract the two like fractions:
   2240/2160 - 567/2160 = 2240 - 567/2160 = 1673/2160

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