 # Even Numbers – Any number that can be divided by 2

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Even Numbers – Any number that can be divided by 2
Odd Numbers – Any number that cannot be divided by 2

ODD OR EVEN. 1. Write O for odd and E for even 2
ODD OR EVEN? 1. Write O for odd and E for even 2. Find the half of the number ____ ____ ___ ____ ___ ____ ___ _____ ___ ____ ___ ____

WHAT NUMBERS ARE PRIME? Let’s look at a number grid from 1 to 100 and see how they were discovered.

Take out the number 1 because it is a special number
HERE’S HOW YOU DO IT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Take out the number 1 because it is a special number

Take out the number 1 because it is a special number
HERE’S HOW YOU DO IT 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Take out the number 1 because it is a special number

Take out numbers that have a composite factor of 2
HERE’S HOW YOU DO IT 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Take out numbers that have a composite factor of 2

HERE’S HOW YOU DO IT 2 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 Take out numbers that have a composite factor of 2 Extra help: Even numbers different from 2.

Take out numbers that have a composite factor of 3
HERE’S HOW YOU DO IT 2 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 Take out numbers that have a composite factor of 3

Take out numbers that have a composite factor of 3
HERE’S HOW YOU DO IT 2 3 5 7 11 13 17 19 23 25 29 31 35 37 41 43 47 49 53 55 59 61 65 67 71 73 77 79 83 85 89 91 95 97 Take out numbers that have a composite factor of 3

Here’s How You Do It 2 3 5 7 11 13 17 19 23 25 29 31 35 37 41 43 47 49 53 55 59 61 65 67 71 73 77 79 83 85 89 91 95 97 Take out numbers that have a composite factor of 5

Take out numbers that have a composite factor of 5
HERE’S HOW YOU DO IT 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 49 53 59 61 67 71 73 77 79 83 89 91 97 Take out numbers that have a composite factor of 5

Here’s How You Do It 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 49 53 59 61 67 71 73 77 79 83 89 91 97 Take out numbers that have a composite factor of 7

Take out numbers that have a composite factor of 7
The PRIME Numbers! 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 Take out numbers that have a composite factor of 7

How do we know numbers are prime?

A prime number cannot be divided by anything other than 1 and itself.
That’s It! A prime number cannot be divided by anything other than 1 and itself. These are numbers that have only two factors – themselves and one. An example of Prime Numbers would be… 1,3 (3 3) (3 1) (3 3)

How do we know numbers are composite?

That’s It! Numbers that have more than two factors . One is included
An example of composite numbers would be: 1,12 2,6 3,4 (1*12) (2*6) (3*4)

PRIME OR COMPOSITE?

96

Composite Number 96 = 1,96 2,38 3, ,24 6,16 8,12,

15

Composite Number 15= 1,3,5,15

47

Prime Number 47= 1, 47

93

Composite Number 93= 1,93 3,31

54

Composite Number 54 = 1, , ,18 6,9

57

Composite Number 57= 1, ,19

19

Prime Number 19= 1,19

Factors are the numbers you multiply together to get a product.
For example, the product 24 has several factors. 24 = 1 x 24 24 = 2 x 12 24 = 3 x 8 24 = 4 x 6 SO, the factors are 1, 2, 3, 4, 6, 8, 12, 24

FINDING FACTORS Start with 1 x the number. Try 2, 3, 4, etc.
When you repeat your factors, cross out the repeat - you’re done at this point. If you get doubles (such as 4 x 4), then you’re done. Repeats or doubles let you know you’re done.

What are the factors of 16? The factors of 16 are 1,2,4,8,16 1 x 16
3 is not a factor, so cross it out 4 x 4 doubles = done The factors of 16 are 1,2,4,8,16

What are the factors of 18?

What are the factors of 18? The factors are 1,2,3,6,9,18 1 x 18 2 x 9
Repeat! Cross it out! We’re done! 6 x 3 The factors are 1,2,3,6,9,18

Find all the factors of each number
Find all the factors of each number. List them in order from least to greatest. 25 ______. _______, _______ 27 _____, ______, _______,_______ 12 ______, ______, _______, _______, _______, _______. 15 _______, _______, _______ ,_______. 3 _______, ________. 18. ______, _______, ________, _______, _______, _______

How to find Prime Factors?
Step 1 – Start with a composite number. 48 Step 2 – Write down a multiplication that equals this number or any pair of factors of this number. 6 x 8 = 48

How to Do Prime Factorization Using a Factor Tree
Step 3 – Find factors of the numbers (factor ) you got in step 2. 48 6 x 8 2 x 3 x 2 x 4

Step 4 – Find factors of these numbers
until all factors are prime numbers. 48 6 x 8 2 x 3 x 2 x 4 2 x 3 x 2 x 2 x 2

2 x 2 x 2 x 2 x 3 Step 6 – Count how many numbers are
the same and write exponents for them. 2 x x 2 x 2 x 3 4 2 x 3 = 48

WORKING TOGETHER!!!!!!!

Prime factor this number
4

Prime factor this number
4 = 4 2 x 2 2 2 = 4

Prime factor this number
6

Prime factor this number
6 = 6 2 x 3

Prime factor this number
22

Prime factor this number
22 2 x 11 = 22

Prime factor this number
12

Prime factor this number
12 = 12 3 x 4 3 x 2 x 2 = 12 2 x 2 x 3 = 12 2 2 x 3 = 12

Prime factor this number
21

Prime factor this number
21 = 21 3 x 7

Find the prime factors of these numbers

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