To get the product of two the same number.
12 x 12 = 144
To get et easily,
Multiply the first number (1x1) = 1
And then the last digit (2x2) = 4
And then to get the mid number simply like this (1x2) + (1x2) = 4
you will get an answer of 144...
try this one 26x26 ? =