number theory

Which of the following numbers is divisible by 833?

• 9

• 7

• 3

• 2

What is the divisibility rule for 3?

• The last digit must be a 3.

• The digits must add up to 9.

• Add up the digits. The sum must be divisible by 3.

• Add up the digits. The sum must be even and divisible by 3.

70 can be evenly divided by which number?

• 5

• 10

• 2

• All of the above

What are prime numbers?

• numbers that can only be divided by 1 and itself

• numbers that have exactly two positive divisors

• numbers that have exactly two divisors

• numbers that are not composite numbers

The product of three consecutive numbers is always divisible by 6

• True

• False

What is the LCM of 2 and 6?

• 1

• 2

• 6

• 12

Fill in the blank with the missing multiple:

7, 14, 21, ___, 35, 42, ...

Fill in the blank for the missing factor of 24:

1, 2, 3, __, 6, 8, 12, 24

What is the GCF of 12 and 42?

• 12

• 6

• 4

• 2

A natural number that possesses exactly two different factors, itself and 1, is called a ________ number.

• Prime

• Composite

• Odd

• Even