SOLUTION: My friend gave me this problem 11x11 = 4 12x12 = 16 13x13 = ? pls help what is the trick in this kind of problem th

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Question 1021143: My friend gave me this problem 11x11 = 4
12x12 = 16
13x13 = ?
pls help what is the trick in this kind of problem thanks in advance
Found 2 solutions by Fombitz, MathTherapy:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Looks like the pattern is just to sum the digits(?),
11x11=1%2B1%2B1%2B1=4
12x12=1%2B2%2B1%2B2=6
13x13=1%2B3%2B1%2B3=8

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

My friend gave me this problem 11x11 = 4
12x12 = 16
13x13 = ?
pls help what is the trick in this kind of problem thanks in advance
13 x 13 appears to be: highlight_green%2836%29