Show:
x4
x5
x6
x7
Challenge
100

1 x 4

4

100

1 x 5

5

100

6 x 2

12

100

7 x 3

21

100

9 x 9

81

200

4 x 4

16

200

5 x 5

25

200

6 x 6

36

200

7 x 7

49

200

12 x 12

144

300

4 x 9

36

300

5 x 8

40

300

6 x 12

72

300

7 x 8

56

300

(2x3) x (4x3)

(2x3) x (4x3)

6 x 12

72

400

4 x 11

44

400

5 x 12

60

400

6 x 13

78

400

7 x 11

77

400

48 x 32

1,536

500

4 x 12

48

500

5 x 25

125

500

6 x 9

54

500

7 x 12

84

500

365x7

2,555