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Summary - Coggle Diagram
Summary
Divisibility test
3
Sum each digit
4
Last 2 digit, multiple 4
2
All even number
5
Last number is 0 or 5
6
Even number divisible by 2 and 3
7
Remove last digit and subtract it from the remaining number
8
Last 3 digit divisible by 8
9
Sum of each digit divisible by 9
10
Last digit is 0
11
Difference (odd + even) number = 0 or multiple 11
12
A number divisible by 3 and 4
13
Multiplied last digit by 4. Add with the remaining number until two digit
14
Number is divisible by 2 and 7
15
Number divisible by 3 & 5
16
Last 4 digits is divisible by 16
17
Last digit multiplied by 9. Remaining number is double. Product multiple of 17
18
Even number divisible by 9
19
sum (double unit digit + remaining number) = divisible by 19
Magic square
Odd number
Even number
Application
Sudoku
Music composition in India
Modulo numbers
a≡ b mod n as a-b is divisible by n
Application
Encrypted message
Application
