### Number Puzzle #155

11×11=171

12×12=220

13×13=251

14×14=304

15×15=?

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read here on how to convert one number from 10 base to another base

by following that:

121/8 = 15 R 1

15/8 = 1 R 7

= 1*8^2 + 7*8^1 + 1*8^0 = 171

thus 15×15 = 225

225/8 = 28 R 1

28/8 = 3 R 4

= 3*8^2 + 4*8^1 + 1*8^0 = 341

OR you can try this online tool to convert the base

Answer courtsey: George Georgiev