Bart practices his trumpet 1 1/4 hours on Monday. Tuesday, and Friday, he practices for 1 1/2 hours. How many hours did he practice altogether

4 hours and 15 minutes. You have to multiply 1.5 by 2 to get 3 hours. Then you have to add another hour from the 1.25. To get 4 hours. Then you divide 60 by 4 because there are 60 min in an hour. To get 15 so the answer is 4 hours and 15 minutes.