1. What is the difference between prime
and composite numbers?
List the first six prime numbers.
2. Prime #: only divisible by two numbers.
Composite #: are divisible by three or
more numbers.
First six prime numbers:
2, 3, 5, 7, 11, 13
3. Learning Target:
Students will learn how to write whole
numbers as the product of prime
factors called prime factorization while
reviewing the meaning of prime and
composite numbers.
4. Factors are the different groups that a
number can be slit into evenly.
Ex. 27 factors are: 1,3,9,27
1 group of 27
3 groups of 9
9 groups of 3
27 groups of 1
5. To find factors - I think about finding
the pot of gold at the end of a rainbow.
36: 1, 2, 3, 4, 6 , 9, 12, 18, 36
6. Keep in mind your Divisibility Rules:
2: # is even (ends in 0,2,4,6,8)
3: if the sum of the digits
is divisible by 3
5: if it ends in a 0 or 5
6: if it is even and divisible by 3
9: if the sum of the digits is
divisible by 9
10: if it ends in a 0
14. Ladder:
Ask each time is your number you have
is divisible by 2. Try 2 until it doesn’t
work any more then try 3. Try 3 until it
doesn’t work any more and so on. You
are finished when you reach the
number 1.