Lessons 21-25

Question 1

Prime Number

Answer 1

A number with only 2 factors, 1 and itself

Question 2

Composite Number

Answer 2

A number with 3 or more factors (all non-prime numbers greater than 1

Question 3

Prime #s less than 10

Answer 3

2, 3, 5, 7

Question 4

Prime #s 10-20

Answer 4

11, 13, 17, 19

Question 5

Prime numbers 20-40

Answer 5

23, 29, 31, 37

Question 6

What are the two methods to find the prime factors of a #?

Answer 6

Factor Tree and Division by Primes

Question 7

How do you use prime factorization to reduce a fraction?

Answer 7

1. Find the prime factors for the numerator and denominator
2. Cancel each pair of prime factors
3. The remaining factors are the reduced fraction. You may have to multiply if there is more than one factor on the top or bottom

Question 8

How do you use prime factorization to find the Greatest Common Factor of two numbers?

Answer 8

1. Prime factorize each number
2. List the common factors
3. Multiply the common factors to find the GCF