Presentation Transcript
Divisibility Rules :Divisibility Rules How do we know when we can divide one number into another exactly? Jenny Russell
Divisibility Rules (2) :Divisibility Rules (2) A number can be divided by 2 if
the last digit is even
Divisibility Rules (3) :Divisibility Rules (3) a number is divisible by 3 if
the sum of the digits is 3, 6 or 9
Divisibility Rules (4) :Divisibility Rules (4) a number is divisible by 4 if
the number made by the last two digits can be divided by 4
Divisibility Rules (5) :Divisibility Rules (5) A number is divisible by 5 if
the last digit is a 5 or a 0
Divisibility Rules (6) :Divisibility Rules (6) A number can be divided by 6 if
the last digit is even and the sum of all the digits is 3, 6 or 9
Divisibility Rules (8) :Divisibility Rules (8) A number is divisible by 8 if
the number made by the last three digits will be divisible by 8
Divisibility Rules (9) :Divisibility Rules (9) A number is divisible by 9 if
the sum of all the digits will add to 9
Divisibility Rules (10) :Divisibility Rules (10) A number can be divided by 10 if
the last digit is a 0
Divisibility Rules :Divisibility Rules A number can be divided by 7 if
……………… can you find a rule?
Divisibility Rules :Divisibility Rules 2, the last digit will be an even number
3, all the digits will add to 3,6 or 9
4, the number made by the last two digits can be divided by 4
5, the last digit will be a 5 or 0
Divisibility Rules :Divisibility Rules 6, the last digit will be even and the digits will add to 3, 6 or 9
8, the number made by the last three digits will be divisible by 8
Divisibility Rules :Divisibility Rules 9, the sum of the digits will be 9
10, the last digit will be a 0
There is no easy test for 7, although some methods have been invented, however it is easier to use a pencil and paper method.
Divisibility Rules :Divisibility Rules Apply these rules to theses numbers:
74,673,042
444,555,448
61,616,168
732,510
66,666,666
179,131,590