Well, just pick one..
1.
8 <- 2 dots
8, 8, 8 <- 6 dots => 6 2.
8 = 2^3
2^3, 2^3, 2^3 -> 2^3(1, 1, 1) => a=2, b=3 => a*b = 2*3 = 6?
3.
In octal system: 8 (dec) = 10 (oct)
Interpreted as binary number: 10 (bin) = 2 (decimal)
=> 2+2+2 = 6?
4.
Declare: a = 3, b = 8