### Number Puzzle #155

11×11=171

12×12=220

13×13=251

14×14=304

15×15=?

Check your answer:- Click here to See Solution

11×11 = 121 = 171 in base 8

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

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

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Pankaj upadhyay says

Ya d answer is 339.

Congrats raju u r d 1st…..!👍

George Georgiev says

Hi guys, the answer is not 339 🙂 It’s playing with the number bases.

Convert all answers from 8th base to 10th base and you get the right multiplication result that will be when you normally multiply the numbers.

Thus:

15*15 = 225 in 10th base, 341 in 8th base.

The answer is 341

Rajaram Chandra Sah (Raju) says

he answer is 339. they are alternately adding 26 and 6 after initializing with 50.

Just look at this.

11*11=> 121+50=171

12*12=> 144+50+26=220

13*13=> 169+50+26+6=251

14*14=> 196+50+26+6+26=304

So now will add another 6 thus,

15*15=> 225+50+26+6+26+6=339

THAT’s IT….. Enjoyyy (Y)