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Practice the 20s squared: 21 squared, 22 squared, 23 squared, and so on, up to 29 squared.
A
B
22^2
484
24^2
576
21^2
441
26^2
676
28^2
784
25^2
625
27^2
729
28^2
784
23^2
529
20^2
400
29^2
841
Mr.Keenan
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