Enter your answers in the boxes then click on "Check" button to open a new window to see how well you have done:

2 - 2		3 - 2		4 - 2		5 - 2		6 - 2		7 - 2
4 - 3		5 - 3		6 - 3		7 - 3		8 - 3		9 - 3
4 - 4		5 - 4		6 - 4		7 - 4		8 - 4		9 - 4
6 - 5		7 - 5		8 - 5		9 - 5		10 - 5		11 - 5
7 - 6		8 - 6		9 - 6		10 - 6		11 - 6		12 - 6