Answers

Add 72/20 and 45/18

1^st number: 3 12/20, 2^nd number: 2 9/18

72/20 + 45/18 is 61/10.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 18 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 20 × 9 = 180,
   72/20 = 72 × 9/20 × 9 = 648/180
3. Likewise, for the 2nd fraction, since 18 × 10 = 180,
   45/18 = 45 × 10/18 × 10 = 450/180
4. Add the two like fractions:
   648/180 + 450/180 = 648 + 450/180 = 1098/180
5. 1098/180 simplified gives 61/10
6. So, 72/20 + 45/18 = 61/10
   In mixed form: 61/10

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