| If you stack the cards in numerical order and look at them from the side, you'll see a pattern that looks something like this: |
![]() |
| The "ones" can be seen in a pattern when the card is viewed from the side. |
![]() |
"Is your number on this
disk?" "Yes"
Then keep all the cards that have a black mark in the left column (the 16's place) |
![]() |
![]() |
"Is your number on this
disk?"
"No" Keep all the cards that do NOT have a black mark in the second from the left column (the 8's place). |
![]() |
![]() |
"Is your number on this
disk?"
"Yes" Keep all the cards that have a black mark in the middle column (the 4's place) |
![]() |
![]() |
"Is your number on this
disk?"
"No" Keep all the cards that do NOT have a black mark in the fourth column (the 2's place) |
![]() |
![]() |
"Is your number on this
disk?"
"Yes" Keep the card that has a black mark in the last column (the 1's place) ... "Your number is 21." "Wow!" |
![]() |