No Dumb Questions 190 - Math Tricks with Dr. Iga
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Oct 1, 2024 
Dr. Kevin Iga, a vibrant mathematics professor from Pepperdine University, brings humor and insight to math tricks. He shares quirky anecdotes about his educational journey and explores divisibility rules with engaging quizzes. The conversation dives into a fascinating math trick involving the number 36,005 and the unique capabilities of savants. Iga also discusses producing authentic Bible-focused content for YouTube, cleverly linking mathematics to historical philosophy and ethical considerations. It's a lively blend of math and meaningful insights!
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Divisibility by Nine
- To check if a number is divisible by nine, add up all its digits.
- If the sum is divisible by nine, then the original number is also divisible by nine.
Nine-Hour Clock Analogy
On a nine-hour clock, multiples of nine reset to zero/nine. This helps simplify divisibility checks because place values (10s, 100s, etc.) become one.
Divisibility by Eleven
- Numbers divisible by eleven can be checked by alternately adding and subtracting digits.
- If the final result is divisible by eleven, the original number is too.