Magic Addition

In this puzzle, the challenge is to make all rows add to the same number (even crossways).

In our example, notice that all lines add to the number nine.

Now you try it. Use the first seven counting numbers.

This time use the first nine numbers.

Now try the first eleven numbers. Which number should go into the center? Why?

Now the "Real" challenge. Use the first seven counting numbers. Numbers in lines of 3 must add to 12.

	In our example, notice that all lines add to the number nine.
	Now you try it. Use the first seven counting numbers.
	This time use the first nine numbers.
	Now try the first eleven numbers. Which number should go into the center? Why?
	Now the "Real" challenge. Use the first seven counting numbers. Numbers in lines of 3 must add to 12.