FACTORS MULTIPLES Mrs Walker 4 th grade math

FACTORS & MULTIPLES Mrs. Walker 4 th grade math

FACTOR Factors are numbers that are multiplied 8 X 8 = 64

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

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

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

Find the factors: 1. 18 2. 24 3. 21 4. 52

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

What are the common factors of: 1. 6 & 9 2. 24 & 48 3. 25 & 45

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

FIND THE GCF 9 1 x 9 3 x 3 12 1 x 12 2 x 6 3 x 4 9 : 1, 3, 9 12: 1, 2, 3, 4, 6, 12

Find the GCF: 1. 2. 12 & 26 9 & 21

WHITE BOARD PRACTICE List the factors: 1. 36 2. 18 3. 27 List the common factors: 1. 18, 22 2. 52, 36 3. 14, 9 List the GCF: 1. 25, 40 2. 30, 42

Math Book Pg. 112 #s 11 -18 And Pg. 113 #s 36 -43

A multiple is the product of a given whole number and another whole number. 4: 4, 8, 12, 1 20, 24… 6,

Multiples form a skip counting pattern! 5: 5, 10, 15, 20, 25, 30…

7: 7, 14, 21, 28, 35, 42…

You use the INVERSE OPERATION of multiplication to see if a specific number is a multiple of the given number. Example: Is 108 a multiple of 6?

1. Find the first 10 multiples of 3 2. Find the first 6 multiples of 8 Is 40 a multiple of 8? Why? Is 63 a multiple of 5? Why? 3. 4.

A multiple that 2 or more numbers have in common. Example: Find the first 3 common multiples of 3 and 6. 3: 3, 6, 9, 1 15, 18… 8, 24, 30, 36… 6: 6, 12, CM: 6, 12, 18

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 and 6 3. 4 and 12 4. 2 and 5

The smallest multiple that 2 or more numbers have in common. LCM = Least Common Multiple Example: Find least common multiples of 6 and 8. 24, 30, 36… 6: 6, 12, 18, 8: 8, 16, 24, 32, 40, 48… LCM: 24

List the first 5 multiples of each number. 1. 2 2. 4 3. 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 19 -26 And MB pg. 113 #s 44 -52