Answers

Add 72/36 and 21/80

1^st number: 2 0/36, 2^nd number: 21/80

72/36 + 21/80 is 181/80.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 36 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 36 × 20 = 720,
   72/36 = 72 × 20/36 × 20 = 1440/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   21/80 = 21 × 9/80 × 9 = 189/720
4. Add the two like fractions:
   1440/720 + 189/720 = 1440 + 189/720 = 1629/720
5. 1629/720 simplified gives 181/80
6. So, 72/36 + 21/80 = 181/80
   In mixed form: 221/80

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