Answers

Subtract 21/80 from 21/4

1^st number: 5 1/4, 2^nd number: 21/80

21/4 - 21/80 is 399/80.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 80 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 4 × 20 = 80,
   21/4 = 21 × 20/4 × 20 = 420/80
3. Likewise, for the 2nd fraction, since 80 × 1 = 80,
   21/80 = 21 × 1/80 × 1 = 21/80
4. Subtract the two like fractions:
   420/80 - 21/80 = 420 - 21/80 = 399/80
5. In mixed form: 479/80

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