prime and composite numbers
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Prime and Composite Numbers. Prime and Composite Numbers Divisibility Rules. Prime and Composite Numbers. Definitions Prime Number ~ is divisible by only the numbers 1 and itself. Composite Numbers ~ Numbers that are divisible by more than two numbers. - PowerPoint PPT PresentationTRANSCRIPT
Prime and Prime and Composite Composite NumbersNumbers
Prime and Composite Prime and Composite NumbersNumbers
Divisibility RulesDivisibility RulesA number is divisible by…A number is divisible by… DivisibleDivisible Not Not
DivisibleDivisible
22 If the last digit is even If the last digit is even (0,2,4,6,8)(0,2,4,6,8)
3,973,9788 4,974,9755
33 If the sum of the digits is If the sum of the digits is divisible by 3divisible by 3
315315 139139
44 If the last two digits form a If the last two digits form a number divisible by 4number divisible by 4
8,58,51212 7,57,51818
55 If the last digit is 0 or 5 If the last digit is 0 or 5 14, 9714, 9755 10, 10, 979788
66 If the number is divisible by If the number is divisible by both 2 and 3both 2 and 3
4848 2020
99 If the sum of the digits is If the sum of the digits is divisible by 9divisible by 9
711711 9393
1010 If the last digits is 0If the last digits is 0 15,9915,9900 10,5310,5366
Prime and Composite Prime and Composite NumbersNumbers
Definitions Definitions Prime Number ~ is divisible by only Prime Number ~ is divisible by only
the numbers 1 and itself. the numbers 1 and itself. Composite Numbers ~ Numbers that Composite Numbers ~ Numbers that
are divisible by more than two are divisible by more than two numbers.numbers.
Divisible ~ Can be divided by a Divisible ~ Can be divided by a number without leaving a remainder. number without leaving a remainder. (factors)(factors)
Prime Numbers 1-50Prime Numbers 1-50
11 22 33 44 55 66 77 88 99 1010
1111
1212 1133
1414 1515 1616 1177
1818 1199
2020
2121 2222 2233
2424 2525 2626 2727 2828 2299
3030
3311
3232 3333 3434 3535 3636 3377
3838 3939 4040
4411
4242 4433
4444 4545 4646 4477
4848 4949 5050
Example AExample A
Prime or Composite?Prime or Composite?
4545
Divisible by: 1, 3, 5, 9, 15, 45Divisible by: 1, 3, 5, 9, 15, 45
CompositeComposite
Example BExample B
Prime or Composite?Prime or Composite?
1313
Divisible by: _______________Divisible by: _______________
Answer? Answer?
Example CExample C
Prime or Composite?Prime or Composite?
4949
Divisible by: _________________Divisible by: _________________
Answer?Answer?
Example DExample D
Prime or Composite?Prime or Composite?
1919
Divisible By: __________________Divisible By: __________________