Even Numbers – Any number that can be divided by 2 Odd Numbers – Any number that cannot be...
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Even Numbers – Any number that can be divided by 2 Odd Numbers – Any number that cannot be divided by 2
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Transcript of Even Numbers – Any number that can be divided by 2 Odd Numbers – Any number that cannot be...
Even Numbers – Any number that can be divided by 2
Odd Numbers – Any number that cannot be divided by 2
ODD OR EVEN?ODD OR EVEN?1. Write O for odd and E for even
2. Find the half of the number. 3____ 39____ 14___ 81____ 25___ 42 ____ 36 ___ 57_____ 54 ___ 72 ____ 71 ___ 63____
WHAT NUMBERS
ARE PRIME?
Let’s look at a number grid from 1 to 100 and see how they were discovered.
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
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
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
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.
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
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
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
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
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
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 How do we know numbers are numbers are
prime?prime?
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 1) (3 1) (3 3)
How do we know How do we know numbers are numbers are composite?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 3,32 4,24 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
57
Composite Number 57= 1,57 3,19
19
Prime Number
19=
1,19
