Tic-Tac-Toe Four in a Row has students practice finding an integral and then evaluating the definite integral. This card set includes four different game cards for students to integrate: polynomial expressions, trigonometry expressions, integration by substitution with polynomials and integration by substitution with trigonometry. Preparation is easy. You only need a copy of a card for each pair of students and then place it in a page protector. It is more fun and engaging than a worksheet.