Luke gained 38 points in each round of a game. If he played 30 rounds of a trivia game How many points did he score in the game?
In one round, Luke gains 38 points. 
In two rounds, Luke gains 38 + 38 = 76 points. 
In three rounds, Luke gains 38 + 38 + 38 = 114 points. 

Do you see the pattern? 

In 30 rounds, Luke gains 38 + 38 + ... + 38 = 38 * 30 = 1140 points.