SOLUTION: Tom found the sum of 9 and 4 by using ten. 2nd grade math riddle HELP!!!!

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Question 667903: Tom found the sum of 9 and 4 by using ten.
2nd grade math riddle HELP!!!!
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

If I am understanding correctly

 9 + 4 = 9 + 1 + 3 = 10 + 3 = 13