David spent a total of 2 1/2 hours working on his computer. He stood up and stretched every 15 minutes before stopping how many times did David stand up and stretch
To find the number of times David stood up and stretched, we need to find the total number of 15-minute intervals in 2 1/2 hours.
There are 60 minutes in 1 hour, so 2 1/2 hours is 2.5 * 60 = <<2.5*60=150>>150 minutes.
To find the number of 15-minute intervals in 150 minutes, we divide 150 by 15: 150 / 15 = <<150/15=10>>10.
Therefore, David stood up and stretched 10 times.