Elapsed Time — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A Grade 4 shift runs 11:50 PM to 4:20 AM. How long is the shift?
A) 4 hours 30 minutes
B) 3 hours 30 minutes
C) 5 hours 30 minutes
D) 4 hours 50 minutes
Grade 4 elapsed time across midnight is the sum of time before 12:00 AM and time after.
2. Convert 275 minutes into hours and minutes for Grade 4 elapsed time.
A) 4 hours 35 minutes
B) 4 hours 15 minutes
C) 3 hours 35 minutes
D) 5 hours 15 minutes
Grade 4 conversions divide total minutes by 60; quotient is hours and remainder is minutes.
3. A Grade 4 marathon broadcast lasts 4 h 25 min, then a 50 min show, then 1 h 40 min news. Total minutes?
A) 415 minutes
B) 395 minutes
C) 405 minutes
D) 365 minutes
Grade 4 students convert each duration to minutes, then add to find the grand total.
4. Starting at 9:35 PM, after 5 h 50 min, a Grade 4 student finishes at:
A) 3:25 AM
B) 2:25 AM
C) 3:55 AM
D) 2:55 AM
Grade 4 elapsed time across midnight adds the duration to the start, switching from PM to AM at 12:00 AM.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A Grade 4 trip across midnight from 10:25 PM to 1:50 AM has elapsed time 3 hours 25 minutes.
Grade 4 elapsed time across midnight splits at 12:00 AM and adds both parts.
2. If three Grade 4 activities take 1 h 20 min, 45 min, and 2 h 10 min, total minutes is 255.
Grade 4 students convert hours-minutes into pure minutes before summing for accuracy.
3. Convert 255 minutes into hours and minutes: 4 hours 15 minutes for Grade 4.
Grade 4 students convert total minutes back into hours and minutes by dividing by 60.
4. Starting at 11:10 PM, a Grade 4 trip of 4 h 35 min ends at 3:45 AM.
Grade 4 elapsed time across midnight adds the duration and switches PM to AM at 12:00 AM.
5. A Grade 4 schedule lasts 6 h 5 min, which converts to 365 minutes total.
Grade 4 conversions change hours-minutes to total minutes by multiplying hours by 60 and adding leftover minutes.