Perfect Squares

Front 1

1 x 1

Back 1

1

Front 2

2 x 2

Back 2

4

Front 3

3 x 3

Back 3

9

Front 4

4 x 4

Back 4

16

Front 5

5 x 5

Back 5

25

Front 6

6 x 6

Back 6

36

Front 7

7 x 7

Back 7

49

Front 8

8 x 8

Back 8

64

Front 9

9 x 9

Back 9

81

Front 10

10 x 10

Back 10

100

Front 11

11 x 11

Back 11

121

Front 12

12 x 12

Back 12

144

Front 13

13 x 13

Back 13

169

Front 14

14 x 14

Back 14

196

Front 15

15 x 15

Back 15

225

Front 16

16 x 16

Back 16

256

Front 17

17 x 17

Back 17

289

Front 18

18 x 18

Back 18

324

Front 19

19 x 19

Back 19

361

Front 20

20 x 20

Back 20

400