Show:
x3
x4
x5
100

3 x 2

What is 6

100
4 x 2
What is 8
100

5 x 2

10

200

3 x 3

What is 9

200

4 x 3

What is 12

200

5 x 3

15

300

3 x 4

What is 12

300

4 x 4

What is 16

300

5 x 4 

20

400

3 x 6

What is 18

400

4 x 5

What is 20

400

5 x 5

25

500

3 x 8

What is 24

500
4 x 7
What is 28
500

5 x 8

40