Answers

Add 21/4 and 56/80

1^st number: 5 1/4, 2^nd number: 56/80

21/4 + 56/80 is 119/20.

Steps for adding 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,
   56/80 = 56 × 1/80 × 1 = 56/80
4. Add the two like fractions:
   420/80 + 56/80 = 420 + 56/80 = 476/80
5. 476/80 simplified gives 119/20
6. So, 21/4 + 56/80 = 119/20
   In mixed form: 519/20

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