Factors, Factor Pairs, Prime, and Composite Numbers

Factors, Factor Pairs, Prime, and Composite Numbers

This week we talked about factors!

• Factors are the numbers you can multiple to get another whole number.

• You can list factors two ways: 1. with their pair (the number you multiple it by to get the larger number, or 2. in a list from least to greatest

Multiple Choice

Is 3 a factor of 21?

• yes

• no

Multiple Select

Check all the correct answers.

Which of the following numbers have 5 as a factor?

• 15

• 20

• 25

• 32

Multiple Select

Check all the correct answers.

Which of the following numbers have 2 as a factor?

• 8

• 10

• 15

• 24

Now we need to talk about PRIME and COMPOSITE numbers!

Prime Numbers

• Prime Numbers only have two factors: 1, and themselves!

• No other numbers can be multiplied together to get that prime number

• Prime numbers from 0-100 are:

• 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97

Compsite Numbers

• The are the OPPOSITE of prime

• Composite numbers have MORE than two factors!

• The easiest way to check if a number is composite is:

• to check if it is even, if so 2 will be one of its factors and it would be considered composite

• if that isn't the case, see if it ends in 0 or 5, if so 5 would be one of its factors and it would be composite

• if it isn't even (ending in 0, 2, 4, 6, or 8) and it doesn't end in 5... then you need to check your multipication chart to see if 3, 4, 6, 7, 8, or 9 is one of that numbers factor's!

But what about ZERO?

The number 0 is not considered prime or composite!

Open Ended

What have you learned through this lesson today?

All of the highlighted numbers in this chart are PRIME! Their only factors are 1 and themselves.

Multiple Choice

Composite numbers have

• no factors.

• one factor.

• two factors.

• three or more factors.

Multiple Choice

A prime number has

• one factor.

• two factors.

• three or more factors.

Multiple Choice

Is 35 prime or composite?

• prime
• composite

Multiple Choice

is 5 prime or composite?

• prime
• composite

Multiple Choice

Is 12 prime or composite?

• prime
• composite

Multiple Choice

Which number below is a prime number?

• 1
• 0
• 2
• 9

Multiple Choice

True or False
0 is a COMPOSITE number.

• TRUE
• FALSE

Multiple Choice

Find the prime number.

• 0
• 1
• 7
• 4

Multiple Choice

the only factors prime numbers have are:

• 0 and 1
• 0 and itself
• 1 and itself
• 1