Elapsed Time Worksheets - Free Printable

It looks like you've uploaded an answer key for an "Elapsed Time Worksheet 4" from Math-Salamanders.com, rather than a problem to solve. The worksheet already contains the correct answers, so I'll go ahead and explain how each part is solved, as if you were working through it step-by-step.

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🔹 Problem 1: Work out the elapsed time between the two times

We calculate the difference between the "Time To" and "Time From" using hours and minutes.

#### Example:
From 13:05 to 18:30

- Subtract hours: 18 – 13 = 5 hours
- Subtract minutes: 30 – 5 = 25 minutes
✔ So, 5 hours 25 minutes

Let’s verify one more:
From 11:45 to 15:30
- Hours: 15 – 11 = 4 hours
- Minutes: 30 – 45 → can't subtract (30 < 45), so borrow 1 hour = 60 minutes
→ 60 + 30 = 90 minutes; 90 – 45 = 45 minutes
→ 4 hours becomes 3 hours
✔ So, 3 hours 45 minutes

All answers in the table are correctly calculated.

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🔹 Problem 2: Fill in the missing times on the chart

Here, we’re given two of the three values (start, end, or elapsed time) and must find the missing one.

#### Example 1:
Time From: 09:40, Elapsed: 1 hour 40 minutes → Find Time To

- Add 1 hour: 09:40 → 10:40
- Add 40 minutes: 10:40 + 40 min = 11:20 ✔

#### Example 2:
Time To: 13:25, Elapsed: 3 hours 20 minutes → Find Time From

- Subtract 3 hours: 13:25 → 10:25
- Subtract 20 minutes: 10:25 – 20 = 10:05 ✔

#### Example 3:
Time From: 15:40, Time To: 18:10 → Elapsed?

- Hours: 18 – 15 = 3 hours
- Minutes: 10 – 40 → need to borrow
→ 18:10 = 17:70
→ 70 – 40 = 30 minutes
→ 17 – 15 = 2 hours
✔ So, 2 hours 30 minutes

All entries match the answers provided.

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🔹 Problem 3: Timer goes off at 08:40 and every 35 minutes until 12:10

We add 35 minutes repeatedly starting at 08:40.

- Start: 08:40
- +35 min → 08:40 + 35 = 09:15
- +35 min → 09:15 + 35 = 09:50
- +35 min → 09:50 + 35 = 10:25
- +35 min → 10:25 + 35 = 11:00
- +35 min → 11:00 + 35 = 11:35
- +35 min → 11:35 + 35 = 12:10 ✔ (stop here)

So the times are:
08:40, 09:15, 09:50, 10:25, 11:00, 11:35, 12:10

All correct!

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✔ Summary

The answer key is correct and complete. Here's a quick breakdown:

| Problem | What Was Done |
|--------|----------------|
| 1 | Calculated elapsed time by subtracting start time from end time (with borrowing when needed) |
| 2 | Used addition or subtraction of time based on known values |
| 3 | Added 35-minute intervals starting at 08:40 until reaching 12:10 |

This worksheet helps students practice:
- Adding and subtracting time
- Understanding 24-hour clock format
- Handling borrowing across hours/minutes

Let me know if you'd like a version of this worksheet without answers (for practice)!