Presentation Transcript
Divisibility :Divisibility Rules
What is Divisibility? :What is Divisibility? Divisibility means that after dividing, there will be NO remainder.
356,821 :356,821 Can you tell by just looking at this number if it is divisible by 2?
by 5?
by 10?
by 3 ?
by 9?
By 6? The divisibility rules
can help
YOU !!!
Divisibility Rules help you learn shortcuts to tell when a number can be divided by another number with NO remainder. :Divisibility Rules help you learn shortcuts to tell when a number can be divided by another number with NO remainder.
Divisibility by 2 :Divisibility by 2 A number is divisible by 2
if the number
is even. 18 ÷ 2 = 9
22 ÷ 2 = 11
(Notice that both of these numbers are even.)
21 ÷ 2 = 10 R1
(Not an even number.)
Are these numbers divisible by 2? :Are these numbers divisible by 2? 127
(Not an even number)
937
(Not an even number)
4678
Divisibility by 5 :Divisibility by 5 A number is divisible by 5 if it ends in 0 or 5.
25 ÷ 5 = 5
23 ÷ 5 = 4 R3
Divisibility by :Divisibility by A number is divisible by 10 if it ends in 0. 30 ÷ 10 = 3
340 ÷ 10 = 34
67 ÷ 10 = 6 R7
784 ÷ 10 =78 R4
Divisibility By: :Divisibility By:
Divisibility by 3 :Divisibility by 3 A number is divisible by 3 if the sum of the digits is divisible by 3.
Is the number 135 divisible by 3?
Add the digits: 1 + 3 + 5 = 9
Yes, 135 is divisible by 3 because the sum of the digits is divisible by 3.
Divisibility by :Divisibility by A number is divisible by 9 if the sum of its digits is divisible by 9. 369 is divisible by 9
because
3 + 6 + 9 =18
1 + 8 = 9
AND
9 is divisible by 9.
Divisibility by 6 :Divisibility by 6 A number is divisible by 6
if it is divisible
by both
2 and 3. Is 42 divisible by 6?
Is 51 divisible by 6?
After All…DIVISIBILITY Rules!! :After All…DIVISIBILITY Rules!!
The End !! :The End !! Divisibility is
Un-frog-getable !!
: THE END
Content:
P. Frye, Oak Grove Elementary School, December 2003
Graphics:
Microsoft Clip Gallery
AllAboutFrogs.org
Frogland