Answers

Add 90/36 and 15/20

1^st number: 2 18/36, 2^nd number: 15/20

90/36 + 15/20 is 13/4.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 36 and 20 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 36 × 5 = 180,
   90/36 = 90 × 5/36 × 5 = 450/180
3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
   15/20 = 15 × 9/20 × 9 = 135/180
4. Add the two like fractions:
   450/180 + 135/180 = 450 + 135/180 = 585/180
5. 585/180 simplified gives 13/4
6. So, 90/36 + 15/20 = 13/4
   In mixed form: 31/4

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