Draw a bar model: Danny = 1 unit (1,296), Ben = 2 units (2,592).

Total = 3 units = 3,888. Equal share = 1.5 units each.

Ben gives 0.5 units = 648 cards.

Ben has	=	2 × 1,296 = 2,592 cards
Total	=	1,296 + 2,592 = 3,888
Equal share each	=	3,888 ÷ 2 = 1,944
Ben gives	=	2,592 - 1,944 = 648