Solve This!

But Who’s Adding is a great game, that helps you learn your addition facts. You need two players to play, unless you have teams. The object of the game is to get four colored chips in a row. Each player plays with different colored chips.
The first player puts a chip on one of the the numbers at the bottom of the game board.

Then the second player looks at the board and finds an addend of the number that the other player placed their chip on. Then he places his chip on that number and also places one on the sum of the two numbers covered. This process continues until one player wins by getting four in a row or they have to draw because there are no other moves.

Click here for a printable version.