This elapsed time worksheet helps students master calculating time differences through varied practice problems and visual matching activities.

Let's solve each part of the Elapsed Time Worksheet step by step.

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Part 1: Work out the elapsed time between the two times.

We'll calculate the difference in minutes between each "Time From" and "Time To."

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1. 4:30 pm to 4:50 pm
→ 50 - 30 = 20 minutes

2. 8:00 am to 8:40 am
→ 40 - 0 = 40 minutes

3. 9:15 am to 9:30 am
→ 30 - 15 = 15 minutes

4. 11:20 am to 12:00 noon
→ From 11:20 to 12:00 is 40 minutes (60 - 20 = 40)
→ 40 minutes

5. 12:45 pm to 1:05 pm
→ From 12:45 to 1:00 = 15 minutes
→ From 1:00 to 1:05 = 5 minutes
→ Total = 15 + 5 = 20 minutes

6. 4:50 pm to 5:20 pm
→ From 4:50 to 5:00 = 10 minutes
→ From 5:00 to 5:20 = 20 minutes
→ Total = 10 + 20 = 30 minutes

7. 3:10 pm to 3:45 pm
→ 45 - 10 = 35 minutes

8. 11:40 am to 12:05 pm
→ From 11:40 to 12:00 = 20 minutes
→ From 12:00 to 12:05 = 5 minutes
→ Total = 20 + 5 = 25 minutes

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✔ Answers for Part 1:
| TIME FROM | TIME TO | ELAPSED TIME |
|----------|-------------|--------------|
| 4:30pm | 4:50pm | 20 minutes |
| 8:00am | 8:40am | 40 minutes |
| 9:15am | 9:30am | 15 minutes |
| 11:20am | 12:00 noon | 40 minutes |
| 12:45pm | 1:05pm | 20 minutes |
| 4:50pm | 5:20pm | 30 minutes |
| 3:10pm | 3:45pm | 35 minutes |
| 11:40am | 12:05pm | 25 minutes |

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Part 2: Draw lines to join up times that have an elapsed time of 20 minutes.

We are given these times:

- 6:20pm
- 4:30pm
- 3:10pm
- 4:50pm
- 2:50pm
- 6:00pm

We need to find pairs where the elapsed time is exactly 20 minutes.

Let’s check all possible combinations:

- 6:20pm to 6:00pm → 20 minutes → ✔ Yes! (Already drawn)
- 4:30pm to 4:50pm → 20 minutes → ✔ Yes!
- 3:10pm to 3:30pm → Not listed → ✘
- 2:50pm to 3:10pm → 20 minutes → ✔ Yes!
- 4:50pm to 5:10pm → Not listed → ✘
- 6:00pm to 6:20pm → Already covered

So, valid pairs:
- 6:20pm ↔ 6:00pm (already drawn)
- 4:30pm ↔ 4:50pm
- 2:50pm ↔ 3:10pm

👉 So we should draw lines between:
- 4:30pm and 4:50pm
- 2:50pm and 3:10pm

(Note: The line from 6:20pm to 6:00pm is already shown.)

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Part 3: A timer goes off at 3pm and every 20 minutes afterwards until 5pm.

Start: 3:00pm
Then every 20 minutes: add 20 min each time until 5:00pm.

Let’s compute:

- 3:00pm
- 3:00 + 20 = 3:20pm
- 3:20 + 20 = 3:40pm
- 3:40 + 20 = 4:00pm
- 4:00 + 20 = 4:20pm
- 4:20 + 20 = 4:40pm
- 4:40 + 20 = 5:00pm ← This is the last one

So the timer goes off at:

3:00pm, 3:20pm, 3:40pm, 4:00pm, 4:20pm, 4:40pm, 5:00pm

But the blank is only 5 spaces after 3:00pm and before 5:00pm.

Wait — the format says:

> 3:00pm _______ _______ _______ _______ _______ 5:00pm

That’s five blanks — meaning five intermediate times.

But let’s count:

From 3:00pm to 5:00pm with 20-minute intervals:

- 3:00pm
- 3:20pm
- 3:40pm
- 4:00pm
- 4:20pm
- 4:40pm
- 5:00pm

That’s 7 times total, including start and end.

The question says: “Write down below times it will go off at?” and shows:

> 3:00pm ___ ___ ___ ___ ___ 5:00pm

→ That means 5 times in between?

But 3:00pm and 5:00pm are already given, so fill in the five in-between times?

Wait — let's see how many steps:

From 3:00pm to 5:00pm is 2 hours = 120 minutes

120 ÷ 20 = 6 intervals → So 7 events (including both ends)

So the full list is:

1. 3:00pm
2. 3:20pm
3. 3:40pm
4. 4:00pm
5. 4:20pm
6. 4:40pm
7. 5:00pm

So the five blanks are for:

- 3:20pm
- 3:40pm
- 4:00pm
- 4:20pm
- 4:40pm

✔ Fill in:

> 3:00pm 3:20pm 3:40pm 4:00pm 4:20pm 4:40pm 5:00pm

(That’s 5 blanks filled correctly.)

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✔ Final Answers:

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#### Part 1: Elapsed Time

| TIME FROM | TIME TO | ELAPSED TIME |
|----------|-------------|--------------|
| 4:30pm | 4:50pm | 20 minutes |
| 8:00am | 8:40am | 40 minutes |
| 9:15am | 9:30am | 15 minutes |
| 11:20am | 12:00 noon | 40 minutes |
| 12:45pm | 1:05pm | 20 minutes |
| 4:50pm | 5:20pm | 30 minutes |
| 3:10pm | 3:45pm | 35 minutes |
| 11:40am | 12:05pm | 25 minutes |

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#### Part 2: Join times with 20-minute elapsed time

Draw lines between:

- 4:30pm and 4:50pm
- 2:50pm and 3:10pm

(And the one already drawn: 6:20pm ↔ 6:00pm)

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#### Part 3: Timer times

Fill in:

> 3:00pm 3:20pm 3:40pm 4:00pm 4:20pm 4:40pm 5:00pm

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✔ All done! Let me know if you'd like this formatted as a printable answer sheet.