probability of rolling a sum greater than 8 with two dice

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A red die and a white die are tossed. Determine the probability of rolling a sum greater than 8, to the nearest hundredth.

my work: First, it is important to note that the results of the two dice are independent (that is, they do not affect each other). Thus, there are 6*6=36 possible outcomes.

Next, we must determine how many successes exist, because Probability=(number of successes)/(number of possibilities).

                   Second Die
     N    1   2   3   4   5   6 
     ---------------------------

F 1 | 2 3 4 5 6 7 i D 2 | 3 4 5 6 7 8 r i 3 | 4 5 6 7 8 9 s e 4 | 5 6 7 8 9 10 t 5 | 6 7 8 9 10 11 6 | 7 8 9 10 11 12

P(sum>8) = 10 successes out of 36 possibilities = 10/36 = 5/18 =0.28