Answers

Subtract 10/84 from 21/8

1^st number: 2 5/8, 2^nd number: 10/84

21/8 - 10/84 is 421/168.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 8 and 84 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 8 × 21 = 168,
   21/8 = 21 × 21/8 × 21 = 441/168
3. Likewise, for the 2nd fraction, since 84 × 2 = 168,
   10/84 = 10 × 2/84 × 2 = 20/168
4. Subtract the two like fractions:
   441/168 - 20/168 = 441 - 20/168 = 421/168
5. In mixed form: 285/168

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