Name _______________________________________________________________
49
Prime Time Numbers
You can put numbers into groups because of ways they are the
same and different. Early mathematicians discovered that most num-
bers can be written as the product of two numbers. Here are some
examples:
4 x 2 = 8
6 x 6 = 36
But some numbers cannot be written this way. They can only be shown as the
product of 1 and the number itself. Here are some examples:
1 x 5 = 5
1 x 17 = 17
These are called
prime numbers.
A prime number is any number greater than 1
that can only be divided by itself and 1 evenly. Here are the first five prime
numbers:
2, 3, 5, 7, 11
Circle all the prime numbers below:
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
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