1. Which of the following is a prime number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a prime number? Why? 4 9 10 13

2. Which of the following is a prime number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a prime number? Why? 4 9 10 13
A prime number is a number whose only factors are 1 and the number.

3. Which of the following is a prime number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a prime number? Why? 4 9 10 13
A prime number is a number whose only factors are 1 and the number.
The number 4 has the factors 1 and 4, but also 2 (2 x 2 = 4).

4. Which of the following is a prime number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a prime number? Why? 4 9 10 13
A prime number is a number whose only factors are 1 and the number.
The number 4 has the factors 1 and 4, but also 2 (2 x 2 = 4).
The number 9 has the factors 1 and 9, but also 3 (3 x 3 = 9).

5. Which of the following is a prime number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a prime number? Why? 4 9 10 13
A prime number is a number whose only factors are 1 and the number.
The number 4 has the factors 1 and 4, but also 2 (2 x 2 = 4).
The number 9 has the factors 1 and 9, but also 3 (3 x 3 = 9).
The number 10 has the factors 1 and 10, but also 2 and 5 (2 x 5 = 10).

6. Which of the following is a prime number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a prime number? Why? 4 9 10 13
A prime number is a number whose only factors are 1 and the number.
The number 4 has the factors 1 and 4, but also 2 (2 x 2 = 4).
The number 9 has the factors 1 and 9, but also 3 (3 x 3 = 9).
The number 10 has the factors 1 and 10, but also 2 and 5 (2 x 5 = 10).
The number 13 has only two factors, 1 and 13, so it is a prime number!

7. Which of the following is a composite number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a composite number? Why? 3 7 12 17

8. Which of the following is a composite number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a composite number? Why? 3 7 12 17
A composite number is a number that can be divided evenly by numbers other than 1 and itself.

9. Which of the following is a composite number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a composite number? Why? 3 7 12 17
A composite number is a number that can be divided evenly by numbers other than 1 and itself.
The number 3 can only be divided by the numbers 1 and 3.

10. Which of the following is a composite number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a composite number? Why? 3 7 12 17
A composite number is a number that can be divided evenly by numbers other than 1 and itself.
The number 3 can only be divided by the numbers 1 and 3.
The number 7 can only be divided by the numbers 1 and 7.

11. Which of the following is a composite number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a composite number? Why? 3 7 12 17
A composite number is a number that can be divided evenly by numbers other than 1 and itself.
The number 3 can only be divided by the numbers 1 and 3.
The number 7 can only be divided by the numbers 1 and 7.
The number 17 can only be divided by the numbers 1 and 17.

12. Which of the following is a composite number? Why?
UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
Which of the following is a composite number? Why? 3 7 12 17
A composite number is a number that can be divided evenly by numbers other than 1 and itself.
The number 3 can only be divided by the numbers 1 and 3.
The number 7 can only be divided by the numbers 1 and 7.
The number 17 can only be divided by the numbers 1 and 17.
The number 12 can be divided by the numbers 1 and 12, but also by 2, 3, 4, and 6. Twelve is a composite number because it has 3 or more factors.

13. UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
The number 18 is a composite number. What are the prime numbers that are factors of 18?

14. UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
The number 18 is a composite number. What are the prime numbers that are factors of 18?
Let’s break the number 18 down into its prime factors. 18

15. UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
The number 18 is a composite number. What are the prime numbers that are factors of 18?
Let’s break the number 18 down into its prime factors.
18 can be divided into the factors 2 and 9. 18 2 9

16. UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
The number 18 is a composite number. What are the prime numbers that are factors of 18?
Let’s break the number 18 down into its prime factors.
18 can be divided into the factors 2 and 9.
9 can be divided into the factors 3 and 3. 18 2 9 3 3

17. UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
The number 18 is a composite number. What are the prime numbers that are factors of 18?
Let’s break the number 18 down into its prime factors.
18 can be divided into the factors 2 and 9.
9 can be divided into the factors 3 and 3. 18
2 and 3 are prime numbers; they cannot be divided by any other numbers besides 1 and themselves. 2 9 3 3

18. UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1)
The number 18 is a composite number. What are the prime numbers that are factors of 18?
Let’s break the number 18 down into its prime factors.
18 can be divided into the factors 2 and 9.
9 can be divided into the factors 3 and 3. 18
2 and 3 are prime numbers; they cannot be divided by any other numbers besides 1 and themselves. 2 9
Therefore, the prime numbers that are factors of 18 (or the prime factors of 18) are 2, 3, and 3. 3 3