Recall that a number is prime if it can only be divided by 1 and itself. For example, 8 is not prime because it can be divided by 2.

7 is prime because it can only be divided by 1 and 7

Sometimes, it is tricky to see if a number is prime or not.

Try putting 93 in the calculator and you will see that 93 is not prime because it can be divided by 3 and 31.

However, 93 looks prime if you do not take time to think about.

Use the calculator below to practice until you have no problem recognizing what a prime number is. Check also prime numbers chart The chart will display all prime numbers from 1 to 5003!

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If you don't know fractions very well, you will probably struggle to do well on most math tests. Build a strong foundation in math today before it is too late!

Buy my fractions ebook now. It offers a thorough coverage of fractions!