Luttrell 2012
103
Name: ______________________
Date: _____
7c – Prime Numbers
Prime numbers
are any number that cannot be divided evenly by another number except for one and itself.
1. Shade any number that is NOT a prime number in the list 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
Here are a few tricks by which you can tell whether a number is divisible:
•
Divided by 2: all even numbers.
•
Divided by 3: if the sum of the digits is divisible by 3.
•
Divided by 5: number ends with 0 or 5
•
Divided by 6: even and rule for 3 works.
•
Divided by 9: if sum of digits is divisible by 9.
•
Divided by 11: if a 3-digit number has the first and last digit sum to be the middle digit.
Using the number tricks above, fill in the blanks.
2. 22,245 is divisible by ____ and ____.
3. 473 is divisible by _____.
4. 6561 is divisible by _____ and _____.
5. 792 is divisible by 2, 3, ____, _____, and ____.
