Transcript Divisibility Rules PPT

2, 3, 4, 5, 6, 9, 10
“Divisible BY”
What does it mean?
“Divisible by” means:
If you divide one number by another, the result is
a whole number WITHOUT a remainder.
Examples:
12 ÷ 6 = 2 No remainder
15 ÷ 5 = 3 No remainder
Divisibility Rule 2
A number is divisible by 2 if the
last digit is even. (0, 2, 4, 6, 8)
Examples:
78
Review Even numbers: ghosteven
3470
Now You Try:
Which number IS NOT divisible by 2?
572
1464
Need More Practice: Numbers Divisible by 2
249
WONDERFUL
It ends in a 0,
2, 4, 6, or 8.
Divisibility Rule 3
A number is divisible by three if the
sum of the digits is divisible by 3.
Examples:
75
369
7 + 5 = 12 12 ÷ 3 = 4 No Remainder
3 +6 + 9 = 18
18 ÷ 3 = 6 No Remainder
Now You Try:
Which number IS NOT divisible by 3?
572
1464
Need More Practice: Numbers Divisible by 3
279
The sum is
divisible by 3.
WONDERFUL
Divisibility Rule 4
A number is divisible by 4 if the last two
digits are divisible by 4.
Examples:
1320 20 ÷ 4 = 5
672
72 ÷ 4 = 18
Now You Try:
Which number IS NOT divisible by 4?
564
4101
Need More Practice: Numbers Divisible by 4
188
WONDERFUL
The last 2 digits are
divisible by 4.
Divisibility Rule 5
A number is divisible by 5 if the last
digit is a 0 or 5.
Examples:
615
1480
ends in a 5
ends on a 0
Now You Try:
Which number IS NOT divisible by 5?
9820
779
Need More Practice: Numbers Divisible by 5
560
The number ends in a
zero or a five.
Wonderful
Divisibility Rule 6
A number is divisible by 6 when it is divisible by
2 AND 3. (prime numbers)
Examples:
408 ends in an even number (2 rule)
sum of the digits is divisible by 3
Review prime and composite numbers: Prime and Composite Numbers
Now You Try:
Which number IS NOT divisible by 6?
8700
523
Need more practice? Numbers Divisible by 6
7602
Way To Go!!
This number is divisible
by 2 and 3.
Divisibility Rule 9
A number is divisible by 9 if the sum of
the digits is divisible by 9.
Examples:
963 9 + 6 + 3 = 18 18 ÷ 9 = 2
5445 5 + 4 + 4 + 5 =18 18 ÷ 9 =2
Now You Try:
Find the number that IS NOT divisible by
9.
9873
636
5541
Need More Practice: Numbers Divisible by 9 and 10
The sum of the digits is
divisible by 9.
Great Job!!!
Divisibility Rule 10
A number is divisible by 10 is it ends in a
ZERO.
Example:
7630 ends in a zero
410
ends in a zero
Now You Try:
Find the number that IS NOT divisible by
ten.
56,920
7537
870
The number ends in a ZERO.
Way To Go!!
Congratulations!
Complete two of the three assignments.
You may complete them on your
computers but print out your answer
sheet.
Assignment 1.doc
chart.doc
assignment3.doc
Now that you have
completed your two
assignments, feel free to
go to the following sites.
THEY ARE SOOOOO MUCH
FUN!!!!!!
Fractions
vectorkids -divisibility rules
Gamequarium Division Games