Multiples and Factors

Which number is NOT prime? 3, 7, 17, 21

• 3

• 7

• 17

• 21

What is the least common multiple (LCM)?

• The LCM of two or more numbers is the smallest number that is a multiple of all of them.

• The LCM is the largest number that divides all given numbers.

• The LCM is the sum of all the given numbers.

• The LCM is the difference between the largest and smallest numbers.

What are the factors of 15?

• 1, 2, 3, 4

• 1, 3, 5, 15

• 2, 5, 10, 15

• 1, 5, 6, 15

How can you tell if a number is divisible by 4?

• A number is divisible by 4 if the last two digits form a number that is divisible by 4.

• A number is divisible by 4 if it is even.

• A number is divisible by 4 if it ends in 0 or 5.

• A number is divisible by 4 if the sum of its digits is divisible by 4.

Which of the following is NOT a factor of 9?

• 0

• 1

• 3

• 9

What is a composite number?

• A natural number greater than 1 that has exactly two factors.

• A natural number greater than 1 that is not prime, meaning it has more than two factors.

• A natural number that is only divisible by itself and 1.

• A natural number that is less than 1.

What is a factor?

• A number that divides another number without leaving a remainder.

• A number that is multiplied by another number to get a product.

• A number that is added to another number to get a sum.

• A number that is subtracted from another number to get a difference.

What is a multiple?

• A number that can be divided by another number without a remainder.

• The result of adding a number to itself multiple times.

• The result of multiplying a number by an integer.

• A number that is less than the original number.

What is the smallest 2-digit prime number?

• 9

• 10

• 11

• 12

How do you determine if a number is a factor of another number?

• Multiply the smaller number by the larger number.

• Divide the larger number by the smaller number. If the result is a whole number, then it is a factor.

• Add the two numbers together and check if the result is even.

• Subtract the smaller number from the larger number and check if the result is zero.