Factors

Factors

Numbers

What are factors?

Objectives

• Define the key terms: factors, prime numbers and prime factors

• Describe prime numbers

  
  

• Identify prime factors

Open Ended

What are the factors of 12?

Open Ended

What are the prime factors of 12?

Content Summary

A factor is a number that divides into another number exactly and without leaving a remainder. Most numbers have an even number of factors; however, a square number has an odd number of factors. A prime number has only two factors - the number itself and 1.

A prime number is a number that is divisible only by itself and 1 (e.g. 2, 3, 5, 7, 11).

Prime factors are factors of a number that are, themselves, prime numbers.

Multiple Choice

What are the first 5 prime numbers?

• 2, 3, 5, 7, 11

• 1, 3, 5, 7, 9

• 1, 3, 5, 11, 13

• 2, 3, 5, 7, 13

Multiple Choice

Choose a prime number from the list.

• 7

• 8

• 9

• 10

Multiple Choice

Which number is a factor of 18

• 4
• 7
• 6
• 12

Multiple Choice

Which number is a factor of 23?

• 8
• 4
• 3
• 1

Multiple Choice

Name the next 3 prime numbers after 23.

• 24, 25, 26
• 29, 30, 31
• 29, 31, 37
• 24, 26, 28

Multiple Choice

Complete the missing prime number   3, 5, __, 11, 13

• 7
• 8
• 9
• 10

Open Ended

How many prime factors does the number 100 have?

Open Ended

What are the prime numbers between 1 and 20?

You have come to the end of the lesson!

Open Ended

What have you learned?