Mrs Walker 4 th grade math Factor 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 ID: 539877
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Slide1
Factors & Multiples
Mrs. Walker4th grade mathSlide2
Factor
Factors are numbers that are multiplied8 X 8 = 64Slide3
…find all the numbers you can multiply together to get that number as the product.
What does “Find the
factors”
m
ean?Slide4
EVERY
number greater than 1 has the number 1 and
itself
as a factor.Slide5
What are the factors of 27?
27:1 X 27
3 X 9
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.
1, 3, 9, 27Slide6
practiceFind the factors:
182421
52Slide7
Common Factors
What does COMMON mean?What does
FACTORS
mean?
So…..
COMMON FACTORS
are:
Factors
that two or more numbers have in
commonSlide8
What are the common factors of 16 and 24?
161 X 16 2 X 8
4 X 4
24
1 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,
16
24
:
1, 2, 3, 4, 6, 8, 12, 24
Common Factors: 1, 2, 4, 8Slide9
PracticeWhat are the common factors of:
6 & 924 & 4825 & 45Slide10
Greatest Common Factor
The greatest factor that both numbers have in common.GCF = Greatest Common FactorSlide11
Find the GCF
91 x 9
3 x 3
9 : 1,3,9
12
1 x 12
2 x 6
3 x 4
12: 1,2,3,4,6,12Slide12
PracticeFind the GCF:
12 & 269 & 21Slide13
White board Practice
List the factors:3618
27
List the common factors:
18, 22
52, 3614, 9
List the GCF:
25, 40
30, 42Slide14
Independent Practice
Math BookPg. 112 #s 11-18And
Pg. 113 #s 36-43Slide15
Multiples
A multiple is the product of a given whole number and another whole number.
4,
8,
12,
16,
20,
24…
4:Slide16
Multiple
Multiples form a skip counting pattern!5: 5, 10, 15, 20, 25, 30…Slide17
List the multiples of 7 up to 42
7:
7,
14,
21,
28,
35,
42…Slide18
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?Slide19
Practice
Find the first 10 multiples of 3Find the first 6 multiples of 8Is 40 a multiple of 8? Why?
Is 63 a multiple of 5? Why?Slide20
Common Multiple
A multiple that 2 or more numbers have in common. Example: Find the first 3 common multiples of 3 and 6.
CM: 6, 12, 18
3,
6,
9,
12,
15,
18…
3:
6,
12,
18,
24,
30,
36…
6:Slide21
Is 36 a common multiple of 6 and 9?
What strategy would you use?That’s Right! Division36 ÷ 6= ?
36 ÷ 9=?
Yes! 36 is a common multiple of 6 and 9.Slide22
Practice1. Is 42 a common multiple of 6 and 9?
List 10 multiples of each number and circle the common multiples.2. 3 and 63. 4 and 12
4. 2 and 5Slide23
Least Common Multiple
The smallest multiple that 2 or more numbers have in common.LCM = Least Common Multiple
Example: Find least common multiples of 6 and 8.
LCM: 24
6,
12,
18,
24,
30,
36…
6:
8,
16,
24,
32,
40,
48…
8:Slide24
White board PracticeList the first 5 multiples of each number.
243. Name the LCM of the following numbers:20 and 54. How many common multiples less than 50 do 8 and 9 have? Name them.Slide25
Independent Practice
MB pg. 112 #s 19-26AndMB pg. 113 #s 44-52