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Table of Contents

⏳ Detailed Explanation of the Topic: Elapsed Time

Elapsed time is all about finding out how much time has passed between a start and an end. It’s like asking, “How long did something take?” or “How much time went by?” When you know the time something started and the time it finished, you can work out the elapsed time.

🕰️ What Is Elapsed Time?

Elapsed time is the amount of time between two clocks or two events. For example, if you start doing your homework at 4 o’clock and finish at 5 o’clock, the elapsed time is 1 hour.

🕒 How to Calculate Elapsed Time Using a Clock

Clocks help us see elapsed time easily because we can count the hours and minutes between the start and finish times.

Here is a simple way to work out elapsed time with a clock:

  1. Look at the starting time.
  2. Look at the finishing time.
  3. Count how many hours or minutes have passed from the start to the end.

Example 1:
Start time: 2 o’clock
End time: 5 o’clock

Counting the hours from 2 to 5, we see that 3 hours have passed. So, the elapsed time is 3 hours.

🚌 How to Calculate Elapsed Time Using Timetables

Timetables show the times when buses or trains arrive or leave. You can also use them to work out elapsed time.

Example 2:
A bus leaves at 10:15 and arrives at 11:00. How long is the journey?

  • Start at 10:15
  • End at 11:00

Count the minutes from 10:15 to 11:00: that’s 45 minutes. So, the elapsed time is 45 minutes.

📏 Using a Number Line to Find Elapsed Time

A number line can help you see elapsed time step by step.

Example with a number line:
Start time: 3:10
End time: 4:00

  1. Start at 3:10
  2. Count in 10-minute steps to 3:20, 3:30, 3:40, 3:50
  3. Then count 10 minutes more to reach 4:00

You counted 5 steps of 10 minutes = 50 minutes. The elapsed time is 50 minutes.

📝 Remember:

  • If you find it tricky, break the time into hours and minutes separately.
  • Practice with clocks and timetables regularly.
  • Use drawings or number lines for better understanding.

✅ To sum up

Elapsed time tells us “how long something takes.” You can find it by looking at the start and end times on clocks or timetables and counting the difference. Using number lines and real-life examples like journeys or activities can make learning elapsed time fun and easy!

✏️ 20 Examination-style Questions on Elapsed Time for Year 3 Maths

  1. Look at the clock. It shows 3:15 pm. What time will it be 45 minutes later?
  2. Emma starts her homework at 9:20 am and finishes at 10:05 am. How long did she spend on her homework?
  3. A train leaves the station at 2:30 pm and arrives at 3:10 pm. How long is the journey?
  4. The school play starts at 6:00 pm and ends at 7:30 pm. How long did the play last?
  5. If the clock shows 11:50 am now, what time will it be in 1 hour and 20 minutes?
  6. A TV programme starts at 4:15 pm and lasts 40 minutes. What time does it finish?
  7. Sarah began swimming practice at 5:10 pm. She swam for 50 minutes. What time did she finish?
  8. What is the elapsed time between 7:25 am and 8:10 am?
  9. The bakery opens at 8:00 am and closes at 3:30 pm. How many hours is the bakery open each day?
  10. Tom’s lesson starts at 1:45 pm and ends at 2:30 pm. How many minutes did the lesson last?
  11. If a film starts at 11:00 am and ends at 12:20 pm, how long is the film?
  12. Look at this digital clock: 15:35. What time was it 25 minutes earlier?
  13. Jack spends 30 minutes reading and 45 minutes playing games. How long does he spend doing these activities altogether?
  14. The library is open from 9:15 am to 4:45 pm. How many hours and minutes is it open?
  15. A bus journey takes 1 hour and 15 minutes. If the bus leaves at 3:50 pm, what time will it arrive?
  16. What is the elapsed time from 10:10 am to 11:00 am on an analog clock?
  17. Lucy started baking a cake at 2:20 pm and finished at 3:05 pm. How long did she bake?
  18. A football match started at 4:40 pm and finished at 5:30 pm. How many minutes did the match last?
  19. If it is 12:45 pm now, what time was it 1 hour and 15 minutes ago?
  20. You go to the park at 3:10 pm and stay there for 1 hour and 10 minutes. What time do you leave the park?

🧮 Answers of the Examination-style Questions on Elapsed Time for Year 3

Here are clear and detailed answers to help you understand how to work out elapsed time. We use simple steps to make it easy for Year 3 students like you to learn how to find out how much time has passed between two times.

Question 1: How long is it from 3:00 pm to 4:00 pm?

Step 1: Start at 3:00 pm.
Step 2: Count forward to 4:00 pm.
Answer: It is 1 hour.

Question 2: The train leaves at 9:15 am and arrives at 10:45 am. How long is the journey?

Step 1: From 9:15 am to 10:15 am is 1 hour.
Step 2: From 10:15 am to 10:45 am is 30 minutes.
Answer: The journey takes 1 hour and 30 minutes.

Question 3: A movie starts at 2:30 pm and lasts 2 hours. What time does it finish?

Step 1: Add 2 hours to 2:30 pm.
Step 2: 2:30 + 2 hours = 4:30 pm.
Answer: The movie finishes at 4:30 pm.

Question 4: If a lesson starts at 11:20 am and ends at 12:05 pm, how long is the lesson?

Step 1: From 11:20 am to 12:00 pm is 40 minutes.
Step 2: From 12:00 pm to 12:05 pm is 5 minutes.
Answer: The lesson lasts 45 minutes.

Question 5: You leave the house at 7:50 am and get to school at 8:30 am. How long did the journey take?

Step 1: From 7:50 am to 8:30 am is 40 minutes.
Answer: The journey took 40 minutes.

Question 6: The school day starts at 9:00 am and finishes at 3:15 pm. How many hours and minutes is the school day?

Step 1: From 9:00 am to 3:00 pm is 6 hours.
Step 2: From 3:00 pm to 3:15 pm is 15 minutes.
Answer: The school day is 6 hours and 15 minutes.

Question 7: A football match starts at 4:45 pm and finishes at 6:30 pm. How long did the match last?

Step 1: From 4:45 pm to 5:45 pm is 1 hour.
Step 2: From 5:45 pm to 6:30 pm is 45 minutes.
Answer: The match lasted 1 hour and 45 minutes.

Question 8: You start reading at 5:20 pm and read for 1 hour and 25 minutes. What time do you finish?

Step 1: Add 1 hour to 5:20 pm = 6:20 pm.
Step 2: Add 25 minutes to 6:20 pm = 6:45 pm.
Answer: You finish reading at 6:45 pm.

Question 9: It takes 15 minutes to walk to the park. If you arrive at 3:45 pm, what time did you leave home?

Step 1: Count backwards 15 minutes from 3:45 pm.
Step 2: 3:45 pm minus 15 minutes = 3:30 pm.
Answer: You left home at 3:30 pm.

Question 10: A TV programme starts at 7:10 pm and finishes at 7:55 pm. How long is the programme?

Step 1: From 7:10 pm to 7:55 pm is 45 minutes.
Answer: The programme is 45 minutes long.

Question 11: If the bus journey lasts 35 minutes and it ends at 9:00 am, when did the bus start?

Step 1: Count backwards 35 minutes from 9:00 am.
Step 2: 9:00 am minus 35 minutes = 8:25 am.
Answer: The bus started at 8:25 am.

Question 12: The clock shows 1:40 pm. What time will it be in 2 hours and 10 minutes?

Step 1: Add 2 hours to 1:40 pm = 3:40 pm.
Step 2: Add 10 minutes to 3:40 pm = 3:50 pm.
Answer: It will be 3:50 pm.

Question 13: A swimming lesson lasts for 50 minutes. If it starts at 4:00 pm, when does it end?

Step 1: Add 50 minutes to 4:00 pm.
Step 2: 4:00 pm plus 50 minutes = 4:50 pm.
Answer: The lesson ends at 4:50 pm.

Question 14: You start your homework at 6:15 pm and finish at 7:00 pm. How long did you spend on homework?

Step 1: From 6:15 pm to 7:00 pm is 45 minutes.
Answer: You spent 45 minutes on homework.

Question 15: The school trip begins at 10:25 am and ends at 2:50 pm. How long did the trip last?

Step 1: From 10:25 am to 2:25 pm is 4 hours.
Step 2: From 2:25 pm to 2:50 pm is 25 minutes.
Answer: The trip lasted 4 hours and 25 minutes.

Question 16: It takes 1 hour and 15 minutes to bake a cake. If you start at 3:05 pm, what time will the cake be ready?

Step 1: Add 1 hour to 3:05 pm = 4:05 pm.
Step 2: Add 15 minutes to 4:05 pm = 4:20 pm.
Answer: The cake will be ready at 4:20 pm.

Question 17: You read a story from 7:50 pm to 8:30 pm. How many minutes did you spend reading?

Step 1: From 7:50 pm to 8:30 pm is 40 minutes.
Answer: You spent 40 minutes reading.

Question 18: A game starts at 1:55 pm and lasts 1 hour and 10 minutes. When does the game finish?

Step 1: Add 1 hour to 1:55 pm = 2:55 pm.
Step 2: Add 10 minutes to 2:55 pm = 3:05 pm.
Answer: The game finishes at 3:05 pm.

Question 19: The lunchtime break lasts for 30 minutes. If it started at 12:20 pm, when does it finish?

Step 1: Add 30 minutes to 12:20 pm = 12:50 pm.
Answer: Lunchtime finishes at 12:50 pm.

Question 20: If school finishes at 3:30 pm and the journey home takes 25 minutes, what time do you get home?

Step 1: Add 25 minutes to 3:30 pm = 3:55 pm.
Answer: You get home at 3:55 pm.

By following these steps and using simple addition or subtraction of hours and minutes, you can solve any elapsed time question easily. Remember to count forwards when finding out how long something lasts and count backwards when working out the start time. Practice makes perfect! 🏆

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