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Prime numbers

By Khan Academy

Can you recognize the prime numbers in this group of numbers? Which are prime, composite, or neither?

Prime and Composite Numbers

By mahalodotcom

Mahalo math expert Allison Moffett teaches about prime and composite numbers. What Are Prime and Composite Numbers?

Recognizing prime and composite numbers | Factors and multiples | Pre-Algebra | Khan Academy

By Khan Academy

Can you recognize the prime numbers in this group of numbers? Which are prime, composite, or neither?

What is a prime number?

Recognizing prime and composite numbers

By Khan Academy

This Kahn Academy video teaches you to recognize prime and composite numbers.

Prime numbers

The prime numbers: {2 3 5 7 11 13 17 19 23 ... and infinitely many more} are the most significant known foundation of the study of integers and while there will not be a great many questions on the SAT or ACT that have to do with prime numbers practically any Factors and Multiples question will be made easier by understanding them. This video shows how to tell which numbers are prime.

Prime numbers

By Khan Academy

What does it mean to be a prime number? Let's progress though some whole numbers and ask ourselves if they meet the criteria. What is the criteria you ask? Watch.

Prime numbers | Factors and multiples | Pre-Algebra | Khan Academy

By Khan Academy

What does it mean to be a prime number? Let's progress though some whole numbers and ask ourselves if they meet the criteria. What is the criteria you ask? Watch.