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Is 1 a Prime Number?

Is One a Prime Number?

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Is 1 a Prime Number?. Prime Numbers - Is one a prime number? A Free Printable poster that explains why 1 is NOT prime. Or is it?

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Prime Number Posters - There are 3 FREE prime number posters in this download. Two posters cover, 'Is One a Prime Number?' and the third poster outlines how to test if a number is prime or not using blocks. 

Is One a Prime Number?

ONE IS NOT PRIME!

I usually try to introduce the concept of 1 not being prime by examining the mathematical definition... very specifically. 

'For a number to be prime it must have TWO distinct (different) factors'. Ham up the word TWO. Use a funny voice.

In 1's case its factors are 1 and 1.

For a number to be prime it must be able to be divided by itself AND 1. Ham up the word AND. Use a funny voice.

In the case of 1 'itself ' IS one.

This poster can then be added to your Math Vocabulary Display as a form of Math Help or reference material :)

Is One a Prime Number?

Prime Number Test - Is a certain number (n) prime? e.g. Is 11 prime? Is 21 prime? etc

Use blocks to see if the poster below helps your students identify prime numbers.

What is a Prime Number?

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Prime Numbers - Is one a prime number? A simple test to see if a number is prime. 3 Posters for your Math Word Wall or Reference Books.

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