Show:
Multiplying by 3
Multiplying by 4
Multiplying by 7
Multiplying by 8
Multiplying by 9
100

3X3

9

100

4X4

16

100

7X4

28

100

8X3

24

100

9X3

27
200

3X5

15

200

4X6

24

200

7X5

30

200

8X5

40

200

9X4

36

300

3X7

21

300

4X5

20

300

7X6

42

300

8X6

48
300

9X6

54

400

3X9

27

400

4X8

32

400

7X8

56

400

8X7

56

400

9X7

63

500

3X10

30

500

4X9

36

500

7X7

49

500

8X9

72

500

9X9

81