Reese has been practicing piano for four hours every week. How many hours will he practice after five months? Think carefully first, then make a decision:
If Reese practices 4 four hours every week, in a month, with four weeks, he would have practiced for 4 * 4 = 16 hours. In five months, Reese would have practiced for 5 * 16 = 80 hours. So, the answer is 80.