1. Number and place value
1.10 Prime and composite numbers
Lesson
Are you ready?
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.
Learn
What are prime and composite numbers? How can we determine if a number is prime or composite? Let's take a look and see.
Apply
Question 1
True or False?
$30$30 is a prime number.
True
AFalse
B
Question 2
True or False?
$63$63 is a composite number.
True
AFalse
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