Answers

Subtract 21/20 from 28/9

1^st number: 3 1/9, 2^nd number: 1 1/20

28/9 - 21/20 is 371/180.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 9 and 20 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 9 × 20 = 180,
   28/9 = 28 × 20/9 × 20 = 560/180
3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
   21/20 = 21 × 9/20 × 9 = 189/180
4. Subtract the two like fractions:
   560/180 - 189/180 = 560 - 189/180 = 371/180
5. In mixed form: 211/180

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