A

easy

100

1x1

1

200

2x4

8

300

3x2

6

400

4x5

20

500

4x8

32

kinda easy

100

7x3

21

200

8x6

48

300

7x6

42

400

6x6

36

500

3x6

18

ok

100

8x7

56

200

6x3 

18

300

2x13

26

400

4x7

28

500

20x3

60

hard

100

8x8

64

200

48÷6

8

300

81÷9

9

400

72÷8

9

500

25÷5

5

very hard

100

9x6

54

200

9x9

81

300

7x7

49

400

7x8

56

500

∞x∞

noting