Prime and composite numbers

We love Math and we think it is so much fun!  Today we learned about prime and composite numbers.

A Prime Number can be divided evenly only by 1 or itself.
And it must be a whole number greater than 1.

Example: 

7 can only be divided evenly by 1 or 7, so it is a prime number.  But 6 can be divided evenly by 1, 2, 3 and 6 so it is NOT a prime number (it is a composite number).

Some whole numbers can be divided up evenly, and some can't!

6 can be divided evenly by 2, or by 3:

6 = 2 × 3

Like this:

or


divided into 2 groups

divided into 3 groups




But 7 cannot be divided up evenly:

And we give them names:

When a number can be divided up evenly it is a Composite Number
When a number can not be divided up evenly it is a Prime Number
So 6 is Composite, but 7 is Prime.

 

We also watched this video: