•You can tell any number selected from four different columns containing eight numbers each. 

•The four lettered columns are special columns that will reveal any one of the fifteen numbers selected. Have someone think of a number between one and sixteen. After they have mentally selected one, show them the card with four columns and ask them to tell you the letter of each column that their number is in. Look at the number at the top of each of the selected columns and add them together. The total of these figures will be their mentally selected number. As an example, let's say someone has thought of the number 14. This only appears in the three columns B, C and D which have the numbers 2, 4, and 8 at the top of their columns, the total of which is 14.