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Tuesday, April 24, 2012

Divisibility Rules - Interactive Math Lesson (Powerpoint)

Divisibility Rules
File:  Interactive lesson (Pptx)
Subject: Mathematics
Lesson: Divisibility Rules
Grade Level: 5-6

Dividing by 1:
All numbers are divisible by 1.

Divisible by 2:
All even numbers are divisible by 2.
Even numbers are numbers that end with either 2, 4, 6, 8, or 0.

Divisible by 3:
Add up the digits of the number.
If that number is divisible by 3, then the original number is.
If your sum is still a big number, continue to add the digits.

Dividing by 4:

If the last 2 digits together are divisible by 4.

Dividing by 5:

If the number ends in 5 or 0.

Dividing by 6:

If the number is divisible by 2 and 3.

Divisible by 7:
There is no specific rule. It can be done through manual division.

Divisible by 8:
If the last three digits are divisible by 8.
If the number is divisible by 2, then by 2 again, and then by 2 again.

Divisible by 9;
The same as dividing by 3.
Add up all the digits.
If that number is divisible by 9 then it is divisible by 9.

Dividing by 10:
If the number ends with a 0.

Watch this video first and decide if you like it before downloading PowerPoint.

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