Show:
3s
4s
5s
6s
7s
100

3x3=?

9


100

3x4=?

12

100

4x5=?

20

100

3x6=?

18

100

3x7=?

21

200

4x3=?

12
200

4x4=?

16

200

5x5=?

25

200

4x6=?

24

200
4x7=?
28
300

5x3=?

15

300

5x4=?

20

300

6x5=?

30

300

5x6=?

30
300

5x7=?

35

400
6x3=?

18

400

6x4=?

24

400

7x5=?

35

400
6x6=?

36

400

6x7=?

42

500

7x3=?

21

500

7x4=?

28

500

8x5=?

40

500

7x6=?

42

500

7x7=?

49