Elapsed Time (Intro) — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A trip starts at 11:00 AM and lasts 2 hours. What time does it end?
A) 1:00 AM
B) 12:00 PM
C) 1:00 PM
D) 2:00 PM
11 AM plus 1 hour is 12 PM; plus 1 more hour is 1 PM.
2. A show starts at 11:30 PM and lasts 1 hour. When does it end?
A) 10:30 PM
B) 11:30 AM
C) 12:30 AM
D) 1:30 AM
11:30 PM plus 30 min is 12:00 AM; plus 30 more is 12:30 AM.
3. A class runs from 11:15 AM for 90 minutes. When does it end?
A) 12:15 PM
B) 12:45 PM
C) 1:15 PM
D) 1:45 PM
11:15 AM plus 1 hour is 12:15 PM; plus 30 minutes is 12:45 PM.
4. A bus ride begins at 11:45 AM and ends at 1:15 PM. How long is it?
A) 30 minutes
B) 1 hour
C) 1 hour 30 minutes
D) 2 hours
11:45 AM to 12:45 PM is 1 hour; 12:45 to 1:15 adds 30 minutes.
Part B: Fill in the Blank
Write the correct answer on each line.
1. When the clock crosses 12:00 at noon, the time label changes from AM to PM.
Noon marks the switch from morning AM hours to afternoon PM hours.
2. At midnight the label changes from PM to AM.
Midnight starts a new day and flips PM back to AM.
3. From 10:00 AM to 1:00 PM is 3 hours.
10 AM to 12 PM is 2 hours; 12 PM to 1 PM adds 1 more hour.
4. From 11:30 PM to 12:30 AM is 1 hour.
11:30 PM plus 1 hour lands on 12:30 AM the next day.
5. A game from 11:00 AM to 12:00 PM lasts 1 hour.
From 11 to 12 is a single hour, crossing into the afternoon.