Solved Examples: Elapsed Time Across the Hour on a Number Line

📚 Quick Study Guide

• ⏱️ Elapsed time is the amount of time that passes between the start and end of an event.
• 🔢 A number line is a visual tool that helps to represent and calculate elapsed time.
• ➕ To find the elapsed time across the hour, break the problem into two parts: time until the next hour, and time after the hour.
• 💡 Use addition to combine the two time intervals to find the total elapsed time.
• ✏️ Example: If an event starts at 10:50 AM and ends at 11:15 AM, the elapsed time is 10 minutes (to 11:00 AM) + 15 minutes (after 11:00 AM) = 25 minutes.

Practice Quiz

1. A movie starts at 2:55 PM and ends at 3:20 PM. What is the elapsed time?

   1. 15 minutes
   2. 20 minutes
   3. 25 minutes
   4. 30 minutes

2. Sarah starts reading a book at 7:40 AM and reads until 8:05 AM. How long did she read?

   1. 15 minutes
   2. 20 minutes
   3. 25 minutes
   4. 30 minutes

3. A bus leaves at 9:52 AM and arrives at 10:10 AM. What is the duration of the bus ride?

   1. 12 minutes
   2. 18 minutes
   3. 22 minutes
   4. 28 minutes

4. John begins his homework at 4:45 PM and finishes at 5:05 PM. How much time did he spend on homework?

   1. 15 minutes
   2. 20 minutes
   3. 25 minutes
   4. 30 minutes

5. A cake goes into the oven at 11:50 AM and is taken out at 12:20 PM. How long was the cake in the oven?

   1. 20 minutes
   2. 25 minutes
   3. 30 minutes
   4. 35 minutes

6. A train departs at 6:58 AM and arrives at 7:18 AM. What is the travel time?

   1. 15 minutes
   2. 20 minutes
   3. 25 minutes
   4. 30 minutes

7. Lisa starts her walk at 1:57 PM and finishes at 2:12 PM. How long did she walk?

   1. 10 minutes
   2. 15 minutes
   3. 20 minutes
   4. 25 minutes