Math Investigations - 4th Grade - Investigation 1 Review

What does "prime number" mean?

• The number is great!

• The number can only be divided by 1 and itself.

• The number can be evenly divided by other numbers.

• All numbers are prime.

Which of these numbers is prime

• 12

• 15

• 11

• 30

What is a factor pair?

• Two numbers that got married.

• Two numbers that are similar.

• Two numbers that when multiplied equal another number.

• Fruit.

What is a composite number?

• All numbers are composite

• A number that can be evenly divided into equal parts.

• Many numbers put together to make a new one.

• A number that goes camping.

In a word problem the words "times as many" tells you to use what operation?

• Addition

• Division

• Subtraction

• Multiplication

Which of these numbers is composite? (there may be more than one answer!)

• 9

• 8

• 4

• 3

George has 2 pigs. Farmer John has three times as many. Which equation shows how many pigs Farmer John has.

• 2 x 3 = 6

• 3 - 2 = 1

• 2 + 3 = 5

• 3 ÷ 2 = 1 r1

How do you know the number 10 is composite?

• Because it can only be divided by itself and 1.

• Because it can be divided evenly into many different numbers.

• What's a composite number?

• Because it is even.

What is a multiple?

• A multiple means lots of different numbers.

• A multiple is a product of two factors.

• A multiple is how you know to multiply.

• Multiple means more than one of a number.

Is 10 a multiple of 5?

• Yes

• No