Answers

Add 80/15 and 21/72

1^st number: 5 5/15, 2^nd number: 21/72

80/15 + 21/72 is 45/8.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 72 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 15 × 24 = 360,
   80/15 = 80 × 24/15 × 24 = 1920/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   21/72 = 21 × 5/72 × 5 = 105/360
4. Add the two like fractions:
   1920/360 + 105/360 = 1920 + 105/360 = 2025/360
5. 2025/360 simplified gives 45/8
6. So, 80/15 + 21/72 = 45/8
   In mixed form: 55/8

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