Divisibility and factors
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Divisibility and Factors. 4.1. Divisibility Rules of 2 and 4. A number is divisible by 2 if the last digit if divisible by 2 A number is divisible by 4 if the last two digits are divisible by 4. Divisibility Rules of 3 and 9.

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Divisibility and Factors

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Divisibility and factors

Divisibility and Factors

4.1


Divisibility rules of 2 and 4

Divisibility Rules of 2 and 4

  • A number is divisible by 2 if the last digit if divisible by 2

  • A number is divisible by 4 if the last two digits are divisible by 4


Divisibility rules of 3 and 9

Divisibility Rules of 3 and 9

  • A number is divisible by 3 is the sum of the digits are divisible by 3

  • A number is divisible by 9 if the sum of a the digits are divisible by 9


Divisibility of 5 and 10

Divisibility of 5 and 10

  • If a number ends in a 5 or 0 its divisible by 5

  • If a number ends in a 0 its divisible by 10


Divisibility of 6

Divisibility of 6

  • If it ends in an even number and if the sum of the digits is divisible by 3.


Examples

Examples:

1.) Is 160 divisible by 5

2.) is 56 divisible by 10

3.) is 53 divisible by 2

4.) is 1118 divisible by 2

5.) is 64 divisible by 9

6.) is 472 divisible by 3

7.) Is 174 divisible by 3

8.)Is 43, 542 divisible by 9


Factor

Factor

  • A number that will divide with out a remainder into another


List the positive factors of each number

List the positive factors of each number

  • 10

  • 21

  • 24

  • 31


Divisibility and factors

What are possible arrangements if there are 36 students singing at a concert. There must be at least 5 students in each row and the same number of students in each row.


Homework

Homework

TB Pg 174 (2-52) even


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