Math in…Magic Out! PIR Thursday October 18, 2018 Dr. Lynda Colgan Queen’s University
Agenda • I know your secret number • I know your age • I know your other secret number • I can see right through a stack of dice
A Baffling Prediction I Know Your Secret Number
Secret Number Magic 1. Pick your favourite number between 1 & 8 2. Multiply by 3 3. Add 3 4. Multiply by 3 5. You'll get a 2 digit number..... 6. Add the digits together 7. On the count of three … shout it out!!!
A Baffling Prediction I Know Your Age (and something else!)
Breaking the Ice… • Pick a number between 2 and 9 • Multiply by 2 • Add 5 • Multiply by 50 • If you have already had your birthday this year, add 1768 • If you have NOT had your birthday yet this year, add 1767 • Subtract the 4-digit year you were born (e.g., 2009)
1 4 1 to 63 2 5 3 6 I know your secret number!
Math Towers Roll 'em, Roll 'em
X-ray Vision
Q eh? eh? and
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