Elapsed Time Worksheet 1 for practicing time calculations and intervals.

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 need to calculate how many minutes pass between the "Time From" and "Time To".

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

2. 8:00am → 8:40am
- 8:40 – 8:00 = 40 minutes
✔ 40 minutes

3. 9:15am → 9:30am
- 9:30 – 9:15 = 15 minutes
✔ 15 minutes

4. 11:20am → 12:00 noon
- From 11:20 to 12:00 is 40 minutes
✔ 40 minutes

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

6. 4:50pm → 5:20pm
- 5:20 – 4:50 = 30 minutes
✔ 30 minutes

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

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

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✔ Part 1 Answers:
| 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 time difference is exactly 20 minutes.

Let’s check all combinations:

- 6:20pm → 6:00pm: 20 minutes (yes) → already connected in image
- 4:30pm → 4:50pm: 20 minutes → yes
- 3:10pm → 3:30pm? Not listed.
- 2:50pm → 3:10pm: 20 minutes → yes!
- 4:50pm → 5:10pm? Not listed.
- 6:00pm → 6:20pm: already matched.

So the correct pairs are:

1. 6:20pm ↔ 6:00pm (already drawn)
2. 4:30pm ↔ 4:50pm → draw a line
3. 2:50pm ↔ 3:10pm → draw a line

✔ Lines to draw:
- Connect 4:30pm to 4:50pm
- Connect 2:50pm to 3:10pm

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Part 3: A timer goes off at 3pm and every 20 minutes afterwards until 5pm. Write down the times it will go off.

Start at 3:00pm, add 20 minutes 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, included

✔ So the sequence is:

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

Fill in the blanks:

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

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✔ Final Answers:

#### Part 1: Elapsed Time
1. 20 minutes
2. 40 minutes
3. 15 minutes
4. 40 minutes
5. 20 minutes
6. 30 minutes
7. 35 minutes
8. 25 minutes

#### Part 2: Match 20-minute intervals
- Draw lines between:
- 4:30pm and 4:50pm
- 2:50pm and 3:10pm
- (Already drawn: 6:20pm and 6:00pm)

#### Part 3: Timer times
> 3:00pm → 3:20pm → 3:40pm → 4:00pm → 4:20pm → 4:40pm → 5:00pm

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Let me know if you'd like this formatted as a printable answer key!