1. View the attached sheet explaining how to use a number line to determine elapsed time. 2. View the attached" store hours" worksheet to determine store hours. Use your number lines if needed. 2. Use the store hours to answer questions a - f. 3. Use the number lines on the last two pages to demonstrate your strategy. 4. If it is too difficult to do on the computer, you can make your number lines on paper with a ruler and upload them when you are done.