Students will review the divisibility rules and learn how a prime number differs from a composite number Let's first review the Sieve of Erasthenes with a 100's chart. sieve of Erasthenes Now let's review the divisibility rules. divisibility tests What is a prime number? A prime number is a whole number with exactly two factors. prime number interactive Composite numbers are whole numbers with more than two factors. Have a pencil and paper ready to ...

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