What is the sum of five and four ninths and seven and five ninths

5 4/9 + 7 5/9 = ???

5 + 7 = 12

4/9 + 5/9 = 9/9 = 1

12 + 1 = 13, so in conclusion, the answer is 13!
Hope this helped!

5 4/9 + 7 5/9            You can split this problem into two parts to make it easier.
(5 + 7) + (4/9 + 5/9)   Do the whole numbers first.
12 + (4/9 + 5/9)           Now do the fractions.
12 + 9/9                       9/9 can be simplified to 1.
12 + 1                           Now, add the two numbers together.
13   

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