This review covers objectives on prime factorization and exponents.

1. • 1. Drills: Multiplication and Division,
Divisibility Tests
• 2. Prime or Composite?
• 3. Objectives for 1.5
• 4. Math Journal #4

2. 1. Factor whole numbers.
To factor a whole number means to
Find the factors of 20. express it as the product of other
whole numbers.
Step 1: Find all the pairs of whole
numbers whose product is 20.

3. 2. Identify even and odd whole numbers, prime
numbers and composite numbers.
If a number is evenly A prime number only has factors
of itself and 1. Composite
divisible by 2 it is even, if numbers are numbers greater
it is not, it is odd. than 1 that are not prime.
Is 39 a prime number?
Is 57 a prime number?

4. 3. Find prime factorizations using a factor tree.
Every prime number can One way of prime factorization is by
be formed by multiplying using a factor tree.
a specific combination of
prime numbers. 90
9 10
This process is called
prime factorization. 3 3 2 5

5. 3. Find prime factorizations using a factor tree.
Use the factor tree to 126
find the prime
factorization of 126. 2 63
9 7
3 3

6. 4. Find prime factorizations using a division
ladder.
One way of prime factorization is by
using a division ladder.
2 280 108 Begin with the smallest prime
number, 2.
2 140
Since 35 is not evenly divisible by 2,
2 70 go to the next prime number that will
5 35 go evenly into 35. 3 won’t work, so
let’s try 5.
7 Since the result is 7, and 7 is a prime
number, we are finished.

7. 5. Use exponential notation.
An exponent is used to indicate
repeated multiplication.
Write each product using exponents.

8. 6. Evaluate exponential expressions.
Find the value of the following
expressions.

9. • Write for 5 minutes. You do not need to
sensor yourself.
• People who are good at math
_____________.