Mrs. Walker 4 th grade math

Factors are numbers that are multiplied 8 X 8 = 64

…find all the numbers you can multiply together to get that number as the product. What does “Find the factors” mean?

EVERY number greater than 1 has the number 1 and itself as a factor.

27: 1 X 27 3 X 9 27: 1, 3, 9, 27 HINT: Always write factors from least to greatest. Remember, you are being asked to find all the numbers that can be multiplied together to get the answer 27.

Find the factors:

What does COMMON mean? What does FACTORS mean? So….. COMMON FACTORS are: Factors that two or more numbers have in common

16 1 X 16 2 X 8 4 X X 24 2 X 12 3 X 8 4 X 6 Hint: Once you repeat a number you’re done!! 16: 1, 2, 4, 8, 1624: 1, 2, 3, 4, 6, 8, 12, 24 Common Factors: 1, 2, 4, 8

What are the common factors of: 1. 6 & & & 45

The greatest factor that both numbers have in common. GCF = Greatest Common Factor

9 1 x 9 3 x 3 9 : 1,3, x 12 2 x 6 3 x 4 12: 1,2,3,4,6,12

Find the GCF: & & 21

List the factors: List the common factors: 1. 18, , , 9 List the GCF: 1. 25, , 42

Math Book Pg. 112 #s And Pg. 113 #s 36-43

Multiples form a skip counting pattern! 5: 5, 10, 15, 20, 25, 30… Example: 15 is a multiple of 5 because it is made up of 3 groups of 5.

Use the inverse operation of multiplication, Division To find multiples!

7: 7, 14, 21, 28, 35, 42

Strategy: Use a division number sentence. 108 ÷ 6= (if the quotient is a whole number then 6 is a multiple.) Solution: Yes, 108 is a multiple of 6 because 108 ÷ 6= 18

Find 10 multiples of:

A multiple that 2 or more numbers have in common.

What strategy would you use? That’s Right! Division 36 ÷ 6= ? 36 ÷ 9=? Yes, 36 is a common multiple of 6 and 9.

1. Is 42 a common multiple of 6 and 9? List 10 multiples of each number and circle the common multiples. 2. 3,6 3. 4, , 5

The lowest multiple that both numbers have in common. LCM EX. What is the LCM of 12 and 24? Strategy : List the multiples of 12 and :12,24 24: 24

List the first 5 multiples of each number Name the LCM of the following numbers: 20 and 5 4. How many common multiples less than 50 do 8 and 9 have? Name them

MB pg. 112 #s And MB pg. 113 #s 44-52