Elementary School Entrance Exam Question
"What number does ? stand for on the last line?"
(taken from here)
8809 = 6
7111 = 0
2172 = 0
6666 = 4
1111 = 0
3213 = 0
7662 = 2
9312 = 1
0000 = 4
2222 = 0
3333 = 0
5555 = 0
8193 = 3
8096 = 5
7777 = 0
9999 = 4
7756 = 1
6855 = 3
9881 = 5
5531 = 0
2581 = ?
Hint (read ONLY if you are stuck!): An "average" preschooler will likely have a much easier time with this than an adult or a very advanced preschooler, since they cannot multiply, do not know large numbers, and can hardly even add,