When we look at factors of numbers, we can see that some numbers only have themselves and $1$1 as factors, while others have more factors. Try this problem to review finding the factors of a number.

What are all the factors of $55$55? Separate the factors with commas.

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What are prime and composite numbers? How can we determine if a number is prime or composite? Let's take a look and see.

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Question 1

True or False?

$30$30 is a prime number.

True
A
False
B

Question 2

True or False?

$63$63 is a composite number.

True
A
False
B

Remember!

There are some conditions to define prime and composite numbers:

every whole number greater than $1$1 is either a prime number or a composite number
all even numbers greater than $2$2 are composite numbers
to be a prime number, it can only have itself and $1$1 as factors
$0$0 and $1$1 are not prime or composite numbers

Outcomes

4.OA.B.4

Find factor pairs for whole numbers in the range 1Ã¢â‚¬â€œ100 using models. Recognize that a whole number is a multiple of each of its factors. Determine whether a given whole number is prime or composite and whether the given number is a multiple of a given one-digit number.

1.12 Prime and composite numbers

Are you ready?