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2015-09-18T19:11:48+08:00

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Since we can see that every digits if some up do not get into 10, we can add from the right.

3 + 2 = 5
6 + 3 = 9
8 + 1 = 9

So the answer is 599

Second way:
round down the digits into hundreds, tens, and ones then get the sum of those. 

300 + 200 = 500 
60 + 30 = 90
8 + 1 = 9

500 + 90 + 9 is 599

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