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The machine is able to tell your number through subtracting the number you put in the box by one then it divides the number by 2 to get your original number. For example: if you put the number 21 in the box, it would tell your number was ten. It does this by doing 21 - 1 which equals 20. Then once it does that, it will divide it by 2 which it makes the number 10. Another example is the number 13. It subtracts 1 from 13, which 13 - 1 equals 12. Then it divides it by two to get the answer 6.