My Book of Divisibility

THE 2’s Example: 30, 42, 24, 76, 98, Must be an even number Number must end in a 0, 2, 4, 6, or 8

THE 3’s Example: 36 Add the digits of the number: = 9 Take the sum of the digits and divide by 3. 9 / 3 = 3  If the number is a whole number, then the original number is divisible by 3

THE 6’s Example: 18 The number must pass the 2’s check The number must also pass the 3’s check If it passes both, then the number is divisible by 6

THE 9’s Example: 18 Add the digits of the number: = 9 Take the sum of the digits and divide by 9. 9 / 9 = 1  If the number is a whole number, then the original number is divisible by 9

THE 5’s Example: 2,550 or 455 The number must end in a 0 or a 5 in order to be divisible by 5.

THE 10’s Any number greater than 0 and ends with a 0 is divisible by 10.

250 / 5 = 50 R = Dividend 5 = Divisor 50 Quotient R0 = Remainder