Answers

Add 72/36 and 18/90

1^st number: 2 0/36, 2^nd number: 18/90

72/36 + 18/90 is 11/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 36 and 90 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 36 × 5 = 180,
   72/36 = 72 × 5/36 × 5 = 360/180
3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
   18/90 = 18 × 2/90 × 2 = 36/180
4. Add the two like fractions:
   360/180 + 36/180 = 360 + 36/180 = 396/180
5. 396/180 simplified gives 11/5
6. So, 72/36 + 18/90 = 11/5
   In mixed form: 21/5

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