Sum Six CardsSum Six Flashcards Cut around the solid borders. Fold along the dashed lines. Front 2 1 1 1 + 1 = 2 Back 2 1 ? 1 + __ = 2 Front 3 2 1 2 + 1 = 3 Back 3 2 ? 2 + __ = 3 Front 4 2 2 2 + 2 = 4 Back 4 ? 2 __ + 2 = 4 Front 4 3 1 3 + 1 = 4 Back 4 3 ? 3 + __ = 4 Front 5 3 2 3 + 2 = 5 Back 5 ? 2 __ + 2 = 5 Front 5 4 1 4 + 1 = 5 Back 5 4 ? 4 + __ = 5 Front 6 3 3 3 + 3 = 6 Back 6 ? 3 __ + 3 = 6 Front 6 4 2 4 + 2 = 6 Back 6 4 ? 4 + __ = 6 Front 6 5 1 5 + 1 = 6 Back 6 ? 1 __ + 1 = 6 Front 5 2 3 2 + 3 = 5 Back 5 2 ? 2 + __ = 5 Front 6 1 5 1 + 5 = 6 Back 6 1 ? 1 + __ = 6 Front 3 1 2 1 + 2 = 3 Back 3 ? 2 __ + 2 = 3