Divisibility Tricks in 5 Levels of Difficulty

To check if a number is divisible by 3, you can add up the digits and see if that number is divisible by 3! Let's explore divisibility tricks like this in 5 levels of difficulty. We'll find divisibility tricks for each number 2-12, and also explore how divisibility tricks work in other bases! Divisibility rules for 2-12 (in base 10), and for working in other bases. 00:00 Introduction 00:19 Divisibility by 2, 5, 10 01:13 Divisibility by 4, 8 02:53 Divisibility by 3, 9 04:54 Divisibility by 11, 7 08:04 Working in Other Bases