Factors, Multiples, Prime and Composite Numbers

Factors, Multiples, Prime



Factors, Multiples, Prime, and Composite Numbers

Factors and Multiples

​Read these definitions to understand the difference

between factors and multiples.

​

Multiple Choice

All even numbers have which number as a factor?

• 3
• 4
• 2
• 5

Multiple Select

Check all the correct answers.

Which of the following numbers have 2 as a factor?

• 68

• 80

• 65

• 94

Multiple Select

Check all the correct answers.

Which of the following numbers have 5 as a factor?

• 75

• 47

• 90

• 51

Multiple Select

Check all the correct answers.

Which of the following numbers have 10 as a factor?

• 30

• 46

• 75

• 80

​Factors

​Use the rainbow method to match up the factors of any number.

​

​Remember: some numbers have an odd number of factors. In those instances, the middle factor will NOT have a match. For example:

​

The factors of 25 are: 1, 5, 25

Multiple Choice

Which factor of 12 is missing in the list of numbers? 1,2,3,4,_,12.

• 5

• 6

• 8

• 10

Multiple Choice

Which lists all the factors of 15?

• 1, 7, 8, 15
• 1, 15
• 1, 3, 5, 15
• 3, 5, 15

Multiple Choice

Which lists all the factors of 16?

• 1, 2, 3, 4, 6, 12, 16
• 1, 2, 3, 6, 8, 16
• 2, 3, 4, 6
• 1, 2, 4, 8, 16

Multiple Choice

Which lists all the factors of 20?

• 1, 2, 4, 5, 10, 20
• 1, 2, 5, 10, 20
• 1, 4, 5, 20
• 1, 2, 10, 20

Multiple Choice

Which lists all the factors of 35?

• 1,35
• 5,7
• 1,3,5,7,35
• 1,5,7,35

Multiple Select

Mrs. Kay has 16 students to put into equal groups. She wants at least 2 groups and at least 4 students in a group.

Select ALL of the possible options.

• 1 group of 16 students

• 2 groups of 8 students

• 4 groups of 4 students

• 8 groups of 2 students

• 16 groups of 1 student

​Prime and Composite

​

Read these definitions to understand the difference

between prime and composite numbers.

​

Multiple Choice

Which of the following statements is true?

• Composite numbers are always even.

• All odd numbers are prime numbers.

• The number 2 is the only even prime number.

Multiple Choice

Which of the following statements is true?

• Composite numbers have exactly 2 factors.

• Prime numbers have exactly 2 factors.

• If a number has a 3 in it, it is prime.

Multiple Choice

Which of the following statements is true?

• 1 is a prime number.

• 1 is a composite number.

• 1 is neither prime nor composite.

• 1 is both prime and composite.

Multiple Choice

Marly noticed that her house number and her friend’s house number are both prime numbers. Which of the following could be their house numbers?

• Marly 13

  Friend 25

• Marly 27

  Friend 15

• Marly 29

  Friend 39

• Marly 31

  Friend 13

Multiple Choice

This year, fall break will start on a Monday in October. The date is a prime number. What could be the date that fall break will start?

• October 1

• October 8

• October 15

• October 29

Multiple Choice

Which of the following lists all of the prime numbers on the clock face?

• 1, 3, 5, 7, 11

• 3, 5, 7, 9, 11

• 2, 3, 7, 9

• 2, 3, 5, 7, 11

Multiple Choice

Which of the following numbers is prime?

• 21

• 37

• 49

• 75

Multiple Choice

Which of the following numbers is composite?

• 2

• 7

• 9

• 11

Multiple Choice

Pablo needs a taxi. The taxi driver told him that her car number was a composite number. Which taxi could be the taxi that Pablo needs to get into?

​Multiples

​

​Notice that the multiples of 5 are all of the answers to the 5 facts!

Multiple Choice

What is the next multiple of 12?

12, 24, 36, 48, _

• 50

• 60

Multiple Choice

Which number is NOT a multiple of 3?

(Remember the rule about numbers divisible by 3!)

• 48

• 28

• 51

Multiple Choice

Find the missing multiple of 10.

10: 10, 20, 30, 40, _, 60, 70, 80

• 100

• 45

• 50

Multiple Choice

List the first 5 multiples of 16

• 1, 2, 4, 8, 16

• 16, 32, 48, 64, 80

Multiple Choice

Fill in the missing multiple.

3: 3, 6, 9, _, 15, 18, 21

• 10

• 11

• 12