Robert is dividing his baseball cards equally among himself,his brother, and his three friends. Robert is left with nine cards. How many cards did Robert give away? Write and solve an equation to solve the problem.
Robert, Brother, Friend 1, Friend 2, Friend 3 Everyone has the same amount of cards so if Robert has 9 so do the others. To solve 4 = Brother, friends 1, 2, 3 Cards given away = 9 x 4 = 36
