Caveman Chang DEMONSTRATES Divisibility Rules aka. Another Math Shortcut

Divisibility rules are a set of rules that let you very quickly determine whether there will be a remainder or not when you divide one number by another number.

Rule for #1: Any number can be divisible by 1.

Rule for #2: Check the last digit of the original number to see if it ends in an even number (0, 2, 6, 8). If it ends in an even number, the original number can be divisible by 2.

Rule for #3: Take the individual digits of the original number and add them together. If the sum of the digits is divisible by 3, the original number can be divisible by 3.

Rule for #4: Check the last 2 digits of the original number to see if it is divisible by 4. If the last 2 digits can be divided by 4, the original number can be divided by 4 with no remainder. If the original number can be divided by 2 twice, it can be divisible by 4.

Practice Problems:
Level 1: 561,334 is not divisible by 3. 9,862,332 is divisible by 3.
Level 2: 43,630,134 is divisible by 2 and not divisible by 4.
Level 3: 3,287,544 is divisible by 1,2,3, and 4.

Song: Path Of The Fireflies
By: AERØHEAD
License: Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)

Link to License: https://creativecommons.org/licenses/by-sa/3.0/

Artist Soundcloud: https://soundcloud.com/aerohead

Artist Spotify: https://open.spotify.com/artist/4DH6a3YPKYkhwlNRQKVBxj?si=_D7QUoF9TLOKN0LsqIxERA&dl_branch=1

Artist Youtube: https://www.youtube.com/channel/UCoZbM1a4PKQ6haa2Ap4TSdg