Answers

Add 80/72 and 45/20

1^st number: 1 8/72, 2^nd number: 2 5/20

80/72 + 45/20 is 121/36.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 20 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 72 × 5 = 360,
   80/72 = 80 × 5/72 × 5 = 400/360
3. Likewise, for the 2nd fraction, since 20 × 18 = 360,
   45/20 = 45 × 18/20 × 18 = 810/360
4. Add the two like fractions:
   400/360 + 810/360 = 400 + 810/360 = 1210/360
5. 1210/360 simplified gives 121/36
6. So, 80/72 + 45/20 = 121/36
   In mixed form: 313/36

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