Divisibility Rules

Divisibility Rules Standard: 7.1.5 Objective: To determine factors of numbers Essential Question: How do I determine factors of a number?

Vocabulary Divisibility: to be able to be divided by another number

A Number is divisible by 2 if: the number is an even number

Example 1,046 is divisible by 2 because it is an even number ending in 0,2,4,6 or 8

A Number is divisible by 3 if:the sum of the digits of the number is divisible by 3

example 342: 3 + 4 + 2 = 9 which is divisible by 3, so 342 is also divisible by 3

A Number is divisible by 4 if: the last two digits of the number are divisible by 4

example 560 is divisible by 4, because the last two digits form the number 60 which is also divisible by 4

A Number is divisible by 5 if: the number ends in a 5 or a 0

example 685 is divisible by 5, because it ends in 5

A Number is divisible by 6 if: the number is divisible by both 2 and 3

Example 912 is divisible by 6, because it is an even number (divisible by 2) and the digits 9 + 1 + 2 = 12 (which is divisible by 3)

A Number is divisible by 9 if: the sum of the digits of the number is divisible by 9

Example 9,801: 9 + 8 + 0 + 1 = 18 which is divisible by 9 so the number 9,801 is divisible by 9 too

A Number is divisible by 10 if: the number ends in 0

example 470 is divisible by 10 because the number ends in 0

A Number is divisible by 12 if: the number is divisible by both 3 and 4

example 624 is divisible by 12 because 6+2+4=12 which is divisible by 3 and the last two digits are divisible by 4

Guided Practice Divisibility Rules Worksheet 1. The number 168 is divisible by: 2 3 4 6 12 2. The number 324 is divisible by: 2 3 4 6 9 12 3. The number 420 is divisible by: 2 3 4 5 6 10 12

Independent practice Complete Divisibility Rules Worksheet #s 4-15 Homework: Divisibility Rules Worksheet due Tomorrow

Divisibility Rules