Remove the lid from a sturdy box. Choose a box from which you can cut nine 3-inch diameter circles out of the bottom.
Draw a diagonal pencil line along the top edge of each long side of the box. Start at the top corner on one side edge and draw the line slanting down diagonally across the long side to about three inches from the bottom of the box at the other edge. Repeat on the opposite long side.
Use the box cutter or sharp scissors to cut along the pencil lines on both sides. Turn the box over so that the bottom faces up. The box should rest on the diagonally cut bottom edges so that one side of the box is higher than the other.
Use a cup rim or other circular shape approximately 3 inches in diameter to trace nine circles on the box bottom. Cut out the circles using the box cutter or scissors.
Paint the entire box with acrylic paint of any color. Include a design of a second color if desired. Let dry completely.
Use the permanent marker to label the cut out circles along the edges with the numbers from 1 to 9. Write one number by each circle.
To play the game, decide on an operation to practice. Have students toss the bean bags through the labeled circles then perform the operation on the numbers through which the beanbags passed. Students get a point if they correctly solve the problem.