4*4=16,1+6=7
5*5=25,2+5=7
6*6=36,3+6=9
7*7=49,4+9=13
8*8=64,6+4=10
9*9=81,8+1=9 so 9 square is 81 sum of these two digit is 9. 9 square is answer.
If the sum of the digits of a given number equals nine or a multiple of nine, nine is a factor of that number.
The answer to this question is at my website aim feliciano980
There are several hundred of them. One example, the smallest, is 1039
34.
36 is twice the product of its digits multiplied. 3 times 6 equals 18, and 18 times 2 equals 36.
63
81
81 -- 8+1 = 9 -- square root of 81 = 9
If the sum of the digits of a given number equals nine or a multiple of nine, nine is a factor of that number.
The answer to this question is at my website aim feliciano980
12
It is another whole number.
There are several hundred of them. One example, the smallest, is 1039
34.
82
12
12