Print out the set of 5 pages on cardstock and/or laminate because you will use this throughout the years like I did!
Ask a student to choose a number (1-31) and tell another student secretly or tell the class without you hearing.
YOU WILL BE ONLY PAYING ATTENTION TO THE NUMBER IN THE TOP RIGHT OF EACH PAGE - 8,16,4,1,2) Ask If the student's number is on the first page. If they say yes, their number is on that page, take note of the number in the right hand corner. After you have shown all 5 pages, add up only the numbers in the right hand corner of the pages the student said yes to. This should give you their number. They will be stunned when you guess correctly!
Make it a class logic question, or kill time at the end of class! Tons of fun!