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SQUARE ROOT - SIMPLE MATHEMATICS FOR PSC

You should memorize the first 25 squares:
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
9
16
25
36
49
64
81
100
121
144
169
196
15
16
17
18
19
20
21
22
23
24
25
225
256
289
324
361
400
441
484
529
576
625
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