Elapsed Time Worksheets - Math Monks - Free Printable
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Step-by-step solution for: Elapsed Time Worksheets - Math Monks
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Show Answer Key & Explanations
Step-by-step solution for: Elapsed Time Worksheets - Math Monks
Let’s solve each problem step by step. We’re finding how much time has passed between two given times — this is called “elapsed time.”
We’ll break it into hours and minutes, and be careful when crossing from AM to PM or vice versa.
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① From 3:45 AM to 6:15 AM
From 3:45 AM to 6:45 AM would be 3 hours — but we stop at 6:15 AM, which is 30 minutes earlier.
So:
3 hours – 30 minutes = 2 hours 30 minutes
✔ Check:
3:45 → 4:45 (1 hr) → 5:45 (2 hrs) → 6:15 (+30 min) → total 2h30m
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② From 1:30 PM to 4:40 PM
From 1:30 to 4:30 is 3 hours. Then add 10 more minutes to reach 4:40.
→ 3 hours 10 minutes
✔ Check:
1:30 → 2:30 → 3:30 → 4:30 (3 hrs), then +10 min → 4:40 → total 3h10m
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③ From 12:20 PM to 6:00 PM
From 12:20 to 6:20 is 6 hours — but we stop at 6:00, so subtract 20 minutes.
→ 6 hours – 20 minutes = 5 hours 40 minutes
✔ Check:
12:20 → 1:20 → 2:20 → 3:20 → 4:20 → 5:20 → 6:00? Wait — better way:
From 12:20 to 6:00:
Hours: 12:20 to 1:20 = 1 hr
... up to 5:20 = 5 hours
Then 5:20 to 6:00 = 40 minutes → total 5h40m ✔️
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④ From 10:35 AM to 3:00 PM
First, from 10:35 AM to 12:35 PM = 2 hours
Then 12:35 PM to 3:00 PM = 2 hours 25 minutes? Let’s do carefully.
Better: Count full hours first.
10:35 AM → 11:35 → 12:35 → 1:35 → 2:35 → that’s 4 hours to 2:35 PM
Then 2:35 to 3:00 = 25 minutes → total 4 hours 25 minutes
Wait — let me recalculate:
From 10:35 AM to 3:00 PM:
Total hours from 10:35 to 3:35 would be 5 hours — but we stop at 3:00, so subtract 35 minutes.
5 hours – 35 minutes = 4 hours 25 minutes → same as above.
✔ Correct: 4 hours 25 minutes
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⑤ From 6:00 AM to 11:20 AM
Easy: 6:00 to 11:00 = 5 hours, plus 20 minutes → 5 hours 20 minutes
✔ Check: 6→7→8→9→10→11 = 5 hrs, +20 min → yes.
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⑥ From 5:30 PM to 9:15 PM
5:30 to 9:30 = 4 hours → but stop at 9:15, so subtract 15 minutes → 3 hours 45 minutes
✔ Check:
5:30 → 6:30 → 7:30 → 8:30 → 9:15? That’s 3h45m?
From 5:30 to 8:30 = 3 hrs, then 8:30 to 9:15 = 45 min → total 3h45m ✔️
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⑦ From 11:45 PM to 2:00 PM
This crosses midnight! So split it.
From 11:45 PM to 12:00 AM = 15 minutes
From 12:00 AM to 2:00 PM = 14 hours (since 12 AM to 12 PM is 12 hrs, then 12 PM to 2 PM is 2 hrs → total 14 hrs)
Add them: 14 hours + 15 minutes = 14 hours 15 minutes
✔ Check:
11:45 PM → 12:00 AM (15 min)
12:00 AM → 12:00 PM (12 hrs)
12:00 PM → 2:00 PM (2 hrs)
Total: 12+2=14 hrs +15 min → 14h15m ✔️
---
⑧ From 1:00 AM to 5:35 AM
Same day, no crossing.
1:00 to 5:00 = 4 hours, plus 35 minutes → 4 hours 35 minutes
✔ Simple: 1→2→3→4→5 = 4 hrs, +35 min → yes.
---
⑨ From 4:10 PM to 9:35 PM
4:10 to 9:10 = 5 hours
Then 9:10 to 9:35 = 25 minutes → total 5 hours 25 minutes
✔ Check: 4:10→5:10→6:10→7:10→8:10→9:10 (5 hrs), +25 min → 9:35 → yes.
---
⑩ From 6:35 AM to 9:40 AM
6:35 to 9:35 = 3 hours
Then 9:35 to 9:40 = 5 minutes → 3 hours 5 minutes
✔ Check: 6:35→7:35→8:35→9:35 (3 hrs), +5 min → 9:40 → yes.
---
⑪ From 8:50 AM to 11:40 PM
Crosses noon and goes late into night.
Break it down:
From 8:50 AM to 12:00 PM (noon):
8:50 → 9:50 → 10:50 → 11:50 → that’s 3 hours to 11:50, then 10 more minutes to 12:00 → so 3h10m to noon.
Actually, better:
From 8:50 AM to 12:00 PM:
12:00 - 8:50 = ?
Think: 8:50 to 9:00 = 10 min
9:00 to 12:00 = 3 hours → total 3h10m to noon.
Then from 12:00 PM to 11:40 PM = 11 hours 40 minutes
Now add both parts:
3h10m + 11h40m = 14 hours 50 minutes
✔ Check:
8:50 AM → 12:00 PM = 3h10m
12:00 PM → 11:40 PM = 11h40m
Total: 3+11=14 hrs, 10+40=50 min → 14h50m ✔️
---
⑫ From 12:00 AM to 5:46 AM
Midnight to early morning — straightforward.
12:00 AM to 5:00 AM = 5 hours
Plus 46 minutes → 5 hours 46 minutes
✔ Check: 12→1→2→3→4→5 = 5 hrs, +46 min → yes.
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Final Answer:
① 2 hours 30 minutes
② 3 hours 10 minutes
③ 5 hours 40 minutes
④ 4 hours 25 minutes
⑤ 5 hours 20 minutes
⑥ 3 hours 45 minutes
⑦ 14 hours 15 minutes
⑧ 4 hours 35 minutes
⑨ 5 hours 25 minutes
⑩ 3 hours 5 minutes
⑪ 14 hours 50 minutes
⑫ 5 hours 46 minutes
We’ll break it into hours and minutes, and be careful when crossing from AM to PM or vice versa.
---
① From 3:45 AM to 6:15 AM
From 3:45 AM to 6:45 AM would be 3 hours — but we stop at 6:15 AM, which is 30 minutes earlier.
So:
3 hours – 30 minutes = 2 hours 30 minutes
✔ Check:
3:45 → 4:45 (1 hr) → 5:45 (2 hrs) → 6:15 (+30 min) → total 2h30m
---
② From 1:30 PM to 4:40 PM
From 1:30 to 4:30 is 3 hours. Then add 10 more minutes to reach 4:40.
→ 3 hours 10 minutes
✔ Check:
1:30 → 2:30 → 3:30 → 4:30 (3 hrs), then +10 min → 4:40 → total 3h10m
---
③ From 12:20 PM to 6:00 PM
From 12:20 to 6:20 is 6 hours — but we stop at 6:00, so subtract 20 minutes.
→ 6 hours – 20 minutes = 5 hours 40 minutes
✔ Check:
12:20 → 1:20 → 2:20 → 3:20 → 4:20 → 5:20 → 6:00? Wait — better way:
From 12:20 to 6:00:
Hours: 12:20 to 1:20 = 1 hr
... up to 5:20 = 5 hours
Then 5:20 to 6:00 = 40 minutes → total 5h40m ✔️
---
④ From 10:35 AM to 3:00 PM
First, from 10:35 AM to 12:35 PM = 2 hours
Then 12:35 PM to 3:00 PM = 2 hours 25 minutes? Let’s do carefully.
Better: Count full hours first.
10:35 AM → 11:35 → 12:35 → 1:35 → 2:35 → that’s 4 hours to 2:35 PM
Then 2:35 to 3:00 = 25 minutes → total 4 hours 25 minutes
Wait — let me recalculate:
From 10:35 AM to 3:00 PM:
Total hours from 10:35 to 3:35 would be 5 hours — but we stop at 3:00, so subtract 35 minutes.
5 hours – 35 minutes = 4 hours 25 minutes → same as above.
✔ Correct: 4 hours 25 minutes
---
⑤ From 6:00 AM to 11:20 AM
Easy: 6:00 to 11:00 = 5 hours, plus 20 minutes → 5 hours 20 minutes
✔ Check: 6→7→8→9→10→11 = 5 hrs, +20 min → yes.
---
⑥ From 5:30 PM to 9:15 PM
5:30 to 9:30 = 4 hours → but stop at 9:15, so subtract 15 minutes → 3 hours 45 minutes
✔ Check:
5:30 → 6:30 → 7:30 → 8:30 → 9:15? That’s 3h45m?
From 5:30 to 8:30 = 3 hrs, then 8:30 to 9:15 = 45 min → total 3h45m ✔️
---
⑦ From 11:45 PM to 2:00 PM
This crosses midnight! So split it.
From 11:45 PM to 12:00 AM = 15 minutes
From 12:00 AM to 2:00 PM = 14 hours (since 12 AM to 12 PM is 12 hrs, then 12 PM to 2 PM is 2 hrs → total 14 hrs)
Add them: 14 hours + 15 minutes = 14 hours 15 minutes
✔ Check:
11:45 PM → 12:00 AM (15 min)
12:00 AM → 12:00 PM (12 hrs)
12:00 PM → 2:00 PM (2 hrs)
Total: 12+2=14 hrs +15 min → 14h15m ✔️
---
⑧ From 1:00 AM to 5:35 AM
Same day, no crossing.
1:00 to 5:00 = 4 hours, plus 35 minutes → 4 hours 35 minutes
✔ Simple: 1→2→3→4→5 = 4 hrs, +35 min → yes.
---
⑨ From 4:10 PM to 9:35 PM
4:10 to 9:10 = 5 hours
Then 9:10 to 9:35 = 25 minutes → total 5 hours 25 minutes
✔ Check: 4:10→5:10→6:10→7:10→8:10→9:10 (5 hrs), +25 min → 9:35 → yes.
---
⑩ From 6:35 AM to 9:40 AM
6:35 to 9:35 = 3 hours
Then 9:35 to 9:40 = 5 minutes → 3 hours 5 minutes
✔ Check: 6:35→7:35→8:35→9:35 (3 hrs), +5 min → 9:40 → yes.
---
⑪ From 8:50 AM to 11:40 PM
Crosses noon and goes late into night.
Break it down:
From 8:50 AM to 12:00 PM (noon):
8:50 → 9:50 → 10:50 → 11:50 → that’s 3 hours to 11:50, then 10 more minutes to 12:00 → so 3h10m to noon.
Actually, better:
From 8:50 AM to 12:00 PM:
12:00 - 8:50 = ?
Think: 8:50 to 9:00 = 10 min
9:00 to 12:00 = 3 hours → total 3h10m to noon.
Then from 12:00 PM to 11:40 PM = 11 hours 40 minutes
Now add both parts:
3h10m + 11h40m = 14 hours 50 minutes
✔ Check:
8:50 AM → 12:00 PM = 3h10m
12:00 PM → 11:40 PM = 11h40m
Total: 3+11=14 hrs, 10+40=50 min → 14h50m ✔️
---
⑫ From 12:00 AM to 5:46 AM
Midnight to early morning — straightforward.
12:00 AM to 5:00 AM = 5 hours
Plus 46 minutes → 5 hours 46 minutes
✔ Check: 12→1→2→3→4→5 = 5 hrs, +46 min → yes.
---
Final Answer:
① 2 hours 30 minutes
② 3 hours 10 minutes
③ 5 hours 40 minutes
④ 4 hours 25 minutes
⑤ 5 hours 20 minutes
⑥ 3 hours 45 minutes
⑦ 14 hours 15 minutes
⑧ 4 hours 35 minutes
⑨ 5 hours 25 minutes
⑩ 3 hours 5 minutes
⑪ 14 hours 50 minutes
⑫ 5 hours 46 minutes
Parent Tip: Review the logic above to help your child master the concept of time lapse worksheet.
