Important Squares and their square root.
THE STUDENT MUST MEMORISE THIS BY TONGUE.

42 = 16112 = 121
52 = 25 √(25)=5
62 = 36 √(36)= 6
72 = 49√(49 ) = 7
82 = 64√(64)= 8
92 = 81 √(81)= 9
102 = 100 √(100) = 10
112 = 121√(121) = 11
122 = 144√(144 ) = 12
132 = 169√(169 ) = 13
142 = 196√(196 ) = 14
152 = 225√(225 ) = 15
162 = 256√(256 ) = 16
172 = 289√(289 ) = 17
202 = 400√(400 ) = 20
252 = 625√(625 ) = 25

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