If 9999 = 4, 8888 = 8, 1816 = 6 then what is 1212 equals to?

Answer 1

The holes in a number count as one point each. Then you multiply how many scorable unique numbers have holes in them by the number of holes.

9999 =4

Each 9 has one hole, so they are worth at total of 4 points

There is only one unique number that scores points, so we multiply that by 1 ... 1(4) = 4

8888=8

Each 8 has two holes, so each 8 counts as two points, so we find their sum. 2+2+2+2=8

There is only one unique number that scores points, so we multiply that by 1 ... 1(8) = 4

1816=6

The 8 has two holes (2 points) and the 6 has one hole (1 point). Add those together (2+1=3). There are two unique numbers that score points, so multiply the sum by 2... (2+1)x3 = 6

1212=0

None of the numbers have holes in them!