Binary Number Trick

binary number trick There are four versions of the binary number trick below. To perform the trick, print out the binary number cards double-sided and cut them out along the dotted lines. Then, have someone think of a number between one and the highest number you see on the cards (1-7 or 1-15 or 1-31 or 1-63). Then, ask them to say yes or no to indicate if their number shows up on each card. For the cards they say yes to, add up the numbers in the top right corner and mathemagically you will have their number. For the 1-7 and 1-15 versions below, young children can set the cards someone says yes to on the side and then count of all the dots on the back to get the number someone is thinking about.

A cool trick with the 1-31 cards is to ask someone to think of the number for the day they were born and then figure it out mathemagically to impress them.

 

 

Early Childhood Version 1-7 (Dots on the back for counting)

[embeddoc url=”https://stemazing.org/wp-content/uploads/2018/06/Binary-Magic-0-7.pdf” download=”all” viewer=”google” ]

 

Early Childhood Version 1-15 (Dots on the back for counting)

[embeddoc url=”https://stemazing.org/wp-content/uploads/2018/06/Binary-Magic-0-15.pdf” download=”all” viewer=”google” ]

 

Advanced Version 1-31 – adding the top left numbers together for “yes” cards

[embeddoc url=”https://stemazing.org/wp-content/uploads/2018/06/Binary-Magic-0-31.pdf” download=”all” viewer=”google” ]

 

Early Childhood Version 1-31 (Dots on the back) – counting and skip counting by 5’s instead of adding numbers

[embeddoc url=”https://stemazing.org/wp-content/uploads/2018/06/Binary-Magic-0-31-count-it.pdf” download=”all” viewer=”google” ]

 

Advanced Version1-63 – adding the top left numbers together for “yes” cards

[embeddoc url=”https://stemazing.org/wp-content/uploads/2018/06/Binary-Magic-0-63.pdf” download=”all” viewer=”google” ]

 

Early Childhood Version 1-63 (Dots on the back) – counting and skip counting by 5’s instead of adding numbers

[embeddoc url=”https://stemazing.org/wp-content/uploads/2018/06/Binary-Magic-0-63-count-it.pdf” download=”all” viewer=”google” ]

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