Answers

Add 70/18 and 45/80

1^st number: 3 16/18, 2^nd number: 45/80

70/18 + 45/80 is 641/144.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 18 × 40 = 720,
   70/18 = 70 × 40/18 × 40 = 2800/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   45/80 = 45 × 9/80 × 9 = 405/720
4. Add the two like fractions:
   2800/720 + 405/720 = 2800 + 405/720 = 3205/720
5. 3205/720 simplified gives 641/144
6. So, 70/18 + 45/80 = 641/144
   In mixed form: 465/144

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