Answers

Add 21/80 and 28/20

1^st number: 21/80, 2^nd number: 1 8/20

21/80 + 28/20 is 133/80.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 20 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 80 × 1 = 80,
   21/80 = 21 × 1/80 × 1 = 21/80
3. Likewise, for the 2nd fraction, since 20 × 4 = 80,
   28/20 = 28 × 4/20 × 4 = 112/80
4. Add the two like fractions:
   21/80 + 112/80 = 21 + 112/80 = 133/80
5. So, 21/80 + 28/20 = 133/80
   In mixed form: 153/80

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