Divisibility Rules

1
Divisibility Rules

• Making friends with fractions

2
The rule for 2
2 goes into every even number.. Even numbers are
numbers that end in 0, 2, 4, 6, or 8
3
The rule for 3
3 will go into a number if 3 goes into the sum of
the digits Example 1,266 The sum of the digits
is 1 2 6 6 15 3 goes into 15.so 3 goes
into 1,266
4
The rule for 4
If 4 goes into the last two digits it goes into
the number Example 240..4 goes into 40 so 4
goes into 240
5
The rule for 5
5 goes into any number that ends in 0 or 5
6
The rule for 6
If 2 and 3 go into a number, so does 6 Example
132.2 goes into it because it is even.3 goes
into it because the sum of the digits is 6.6
goes into it because 2 and 3 do
7
The rule for 7
Take the last digit and double it.subtract that
from the remaining digitscontinue until you get
a number that is divisible by 7 Example
133take the last digit and double it..3 x 2
6 13 6 7.7 goes into 7 so 7 goes into 133.
8
The rule for 8
Not on our list, because its a rotten rule! If 8
goes into the last 3 digits, it goes into the
number.
9
The rule for 9
Same as the rule for 3..if 9 goes into the sum
of the digits it goes into the number. Example
1,233.the sum of the digits is 99 goes into 9
so 9 goes into 1,233
10
The rule for 10
10 goes into any number that ends in 0
11
What will divide evenly into

• 222
• 224
• 1,200
• 7,011
• 156
• 440
• 812