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Hundreds Chart
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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 |
DIRECTIONS: Make a
copy of this page and follow the directions. You will be left with all
the prime numbers between 1 and 100, and they will be highlighted!
- Highlight 2 (the smallest prime
number), and starting with 4 cross out all even numbers (they
are multiples of 2).
- Highlight 3, and starting with 6
cross out every third number (multiples of 3).
- What happens when you go
to cross out multiples of four?
- Highlight 5, and starting with
10 cross out every fifth number (multiples of 5).
- What happens when
you go to cross out multiples of six?
- Highlight 7, and starting
with 14 cross out every seventh number (multiples of 7).
What happens when you go to cross
out multiples of eight? Do you now know that you do not have to
cross out any more multiples that are even numbers?
- Cross out
multiples of 9, starting with 9. Are there any new numbers that
have just been crossed out for the first time? There shouldn't
be, because all multiples of 9 are already multiples of 3.
- Any reason to cross out multiples
of 10?
- Highlight 11, and starting with
22 cross out every 11th number. Did you find any "new" cross
outs"?
The numbers 0 and 1 are
considered neither prime nor composite, but any other numbers that are
not crossed out on your chart are now to be highlighted, as these
numbers are all Prime! Congratulations, you now know all the Prime
Numbers less than 100!
Check your answers?
Back to
Lesson?
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