Prime, Composite and Divisibility

Front

What is a prime number?

Back

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Tags

CCSS.4.OA.B.4

Front

What is a composite number?

Back

A composite number is a natural number greater than 1 that is not prime, meaning it has at least one positive divisor other than 1 and itself.

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CCSS.4.OA.B.4

Front

Is the number 1 considered prime or composite?

Back

Neither; the number 1 is neither prime nor composite.

Tags

CCSS.4.OA.B.4

Front

What is the definition of divisibility?

Back

A number 'a' is divisible by another number 'b' if there exists an integer 'k' such that a = b * k.

Front

What are the divisibility rules for 2?

Back

A number is divisible by 2 if it is even, meaning its last digit is 0, 2, 4, 6, or 8.

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CCSS.2.OA.C.3

Front

What are the divisibility rules for 3?

Back

A number is divisible by 3 if the sum of its digits is divisible by 3.

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CCSS.3.OA.D.9

Front

What are the divisibility rules for 5?

Back

A number is divisible by 5 if its last digit is 0 or 5.

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CCSS.3.OA.D.9

Front

How can you determine if a number is prime?

Back

To determine if a number is prime, check if it has any divisors other than 1 and itself by testing divisibility with prime numbers up to its square root.

Tags

CCSS.4.OA.B.4

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

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CCSS.4.OA.B.4

Front

What is the largest two-digit prime number?

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The largest two-digit prime number is 97.

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CCSS.4.OA.B.4