Factors and Multiples OA4

Factors and Multiples OA4

What are Factors?

1. Factors are the two numbers you multiply to get a certain number.
2. To find factors of a number, you can break down that number into equal groups.
3. We can use a T chart to list our factors.

Multiple Choice

What are all the factors of 32?

Clue: Build it on a T chart

• 1, 2, 4, 8, 16, 32

• 1, 2, 4, 8, 32

• 1, 2, 4, 6, 16, 32

• 2, 4, 8, 16, 32

Multiple Choice

Which number has the factors 2, 5, and 8?

Clue: List the factors of the numbers below to find out.

• 10

• 16

• 40

• 48

Multiple Choice

Which of the following numbers has exactly 3 factors?

Clue: list the factors of each number and count them. Count each number only once.

• 25

• 10

• 5

• 1

Multiple Select

A dog pen has an area (length x width) of 48 feet squared. What two choices could be possible lengths and widths?

Clue: Think of the factors of 48

• 1 times 48

• 2 times 22

• 3 times 24

• 4 times 12

What are Common factors

1. Common factors means same factors
2. To know if two numbers have common (same) factors, we will have to list the factors of each number on a T chart and compare them to see which factors are the same).

Multiple Choice

What are the common factors of 18 and 24?

Clue: list the factors of 18 and 24 to see which numbers are the same.

• 1, 2, 3, 6, 9

• 2, 3, 6, 8

• 1, 2,3,6

• 1, 2, 3, 4, 6

What are multiples?

1. We can skip count to find multiples; for example multiples of 2: 2, 4, 6, 8, 10....
2. We can use a multiplication chart to find multiples of numbers.

Multiple Select

Select all the multiples of 9

Clue: skip count by 9

• 1

• 9

• 3

• 27

• 18

Multiple Choice

What is a multiple of both 4 and 8?

Clue: list the multiples of 4 and 8 and see which number is the same for both.

• 1

• 2

• 16

• 20

Prime Numbers

To know if a number is prime, list the factors of that number.

A Prime number has only 2 factors- 1 and itself

Composite Numbers

To know if a number is composite, list the factors of that number.

A Composite number has more than 2 factors

Multiple Choice

Which of the following is a composite number?

Clue: List the factors of the numbers on a T chart

• 43

• 47

• 49

• 53

Multiple Choice

Which of the following numbers is prime?

Clue: List the factors of the numbers on a T chart

• 38

• 39

• 40

• 41