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’ll calculate how much time has passed between the two given times.
We can break it into hours and minutes, or convert everything to minutes past midnight — but for simplicity, we’ll do it hour-by-hour and minute-by-minute.
---
① From 3:45 AM to 6:15 AM
From 3:45 to 4:45 → 1 hour
From 4:45 to 5:45 → 1 hour
From 5:45 to 6:15 → 30 minutes
Total = 2 hours + 30 minutes = 2 hours 30 minutes
---
② From 1:30 PM to 4:40 PM
From 1:30 to 2:30 → 1 hour
From 2:30 to 3:30 → 1 hour
From 3:30 to 4:30 → 1 hour
From 4:30 to 4:40 → 10 minutes
Total = 3 hours + 10 minutes = 3 hours 10 minutes
---
③ From 12:20 PM to 6:00 PM
From 12:20 to 1:20 → 1 hour
... up to 5:20 → that’s 5 hours (from 12:20 to 5:20)
Then from 5:20 to 6:00 → 40 minutes
Total = 5 hours + 40 minutes = 5 hours 40 minutes
Wait — let’s count again:
12:20 → 1:20 (1h)
1:20 → 2:20 (2h)
2:20 → 3:20 (3h)
3:20 → 4:20 (4h)
4:20 → 5:20 (5h)
5:20 → 6:00 → 40 min
Yes, total = 5 hours 40 minutes
---
④ From 10:35 AM to 3:00 PM
First, from 10:35 AM to 12:35 PM → 2 hours
Then from 12:35 PM to 3:00 PM → 2 hours 25 minutes? Wait, better way:
From 10:35 to 11:35 → 1h
11:35 to 12:35 → 1h
12:35 to 1:35 → 1h
1:35 to 2:35 → 1h
2:35 to 3:00 → 25 minutes
That’s 4 hours + 25 minutes = 4 hours 25 minutes
Alternatively:
From 10:35 AM to 3:00 PM is same as 10:35 to 15:00 in 24-hour time.
15:00 - 10:35 = ?
15:00 minus 10:35:
Borrow 1 hour → 14:60 - 10:35 = 4 hours 25 minutes → same answer.
✔ 4 hours 25 minutes
---
⑤ From 6:00 AM to 11:20 AM
Easy: 6 to 11 is 5 hours, plus 20 minutes → 5 hours 20 minutes
---
⑥ From 5:30 PM to 9:15 PM
5:30 to 6:30 → 1h
6:30 to 7:30 → 1h
7:30 to 8:30 → 1h
8:30 to 9:15 → 45 minutes
Total = 3 hours + 45 minutes = 3 hours 45 minutes
---
⑦ From 11:45 PM to 2:00 PM
This crosses midnight! So we 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 hours, then 12 PM to 2 PM is 2 more → 14 hours)
Wait — 12:00 AM to 2:00 PM is actually 14 hours? Let’s check:
12:00 AM → 12:00 PM = 12 hours
12:00 PM → 2:00 PM = 2 hours → total 14 hours
Plus the first 15 minutes → total = 14 hours 15 minutes
But wait — from 11:45 PM to 2:00 PM next day.
Actually, from 11:45 PM to 12:00 AM = 15 min
Then 12:00 AM to 2:00 PM = 14 hours
So yes → 14 hours 15 minutes
---
⑧ From 1:00 AM to 5:35 AM
Straightforward: 1 to 5 is 4 hours, plus 35 minutes → 4 hours 35 minutes
---
⑨ From 4:10 PM to 9:35 PM
4:10 to 5:10 → 1h
5:10 to 6:10 → 1h
6:10 to 7:10 → 1h
7:10 to 8:10 → 1h
8:10 to 9:10 → 1h → that’s 5 hours so far
Then 9:10 to 9:35 → 25 minutes
Total = 5 hours + 25 minutes = 5 hours 25 minutes
---
⑩ From 6:35 AM to 9:40 AM
6:35 to 7:35 → 1h
7:35 to 8:35 → 1h
8:35 to 9:35 → 1h → 3 hours
Then 9:35 to 9:40 → 5 minutes
Total = 3 hours 5 minutes
---
⑪ From 8:50 AM to 11:40 PM
Again, crosses noon.
From 8:50 AM to 12:00 PM → let’s calculate:
8:50 to 9:50 → 1h
9:50 to 10:50 → 1h
10:50 to 11:50 → 1h → but we only go to 12:00 PM? Wait no — 8:50 AM to 12:00 PM is:
From 8:50 to 12:00 → 3 hours 10 minutes? Let's see:
8:50 to 9:00 → 10 min
9:00 to 12:00 → 3 hours → total 3h 10min
Then from 12:00 PM to 11:40 PM → 11 hours 40 minutes
Wait — 12:00 PM to 11:40 PM is almost 12 hours, but not quite.
Actually, 12:00 PM to 11:40 PM = 11 hours 40 minutes
So total elapsed time:
From 8:50 AM to 12:00 PM = 3 hours 10 minutes
From 12:00 PM to 11:40 PM = 11 hours 40 minutes
Add them: 3h10m + 11h40m = 14 hours 50 minutes
Check: 8:50 AM to 8:50 PM is 12 hours
Then 8:50 PM to 11:40 PM = 2 hours 50 minutes
Total = 12h + 2h50m = 14h50m → same!
✔ 14 hours 50 minutes
---
⑫ From 12:00 AM to 5:46 AM
Simple: 12:00 AM to 5:00 AM = 5 hours
Plus 46 minutes → 5 hours 46 minutes
---
Now let’s list all answers clearly:
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 can break it into hours and minutes, or convert everything to minutes past midnight — but for simplicity, we’ll do it hour-by-hour and minute-by-minute.
---
① From 3:45 AM to 6:15 AM
From 3:45 to 4:45 → 1 hour
From 4:45 to 5:45 → 1 hour
From 5:45 to 6:15 → 30 minutes
Total = 2 hours + 30 minutes = 2 hours 30 minutes
---
② From 1:30 PM to 4:40 PM
From 1:30 to 2:30 → 1 hour
From 2:30 to 3:30 → 1 hour
From 3:30 to 4:30 → 1 hour
From 4:30 to 4:40 → 10 minutes
Total = 3 hours + 10 minutes = 3 hours 10 minutes
---
③ From 12:20 PM to 6:00 PM
From 12:20 to 1:20 → 1 hour
... up to 5:20 → that’s 5 hours (from 12:20 to 5:20)
Then from 5:20 to 6:00 → 40 minutes
Total = 5 hours + 40 minutes = 5 hours 40 minutes
Wait — let’s count again:
12:20 → 1:20 (1h)
1:20 → 2:20 (2h)
2:20 → 3:20 (3h)
3:20 → 4:20 (4h)
4:20 → 5:20 (5h)
5:20 → 6:00 → 40 min
Yes, total = 5 hours 40 minutes
---
④ From 10:35 AM to 3:00 PM
First, from 10:35 AM to 12:35 PM → 2 hours
Then from 12:35 PM to 3:00 PM → 2 hours 25 minutes? Wait, better way:
From 10:35 to 11:35 → 1h
11:35 to 12:35 → 1h
12:35 to 1:35 → 1h
1:35 to 2:35 → 1h
2:35 to 3:00 → 25 minutes
That’s 4 hours + 25 minutes = 4 hours 25 minutes
Alternatively:
From 10:35 AM to 3:00 PM is same as 10:35 to 15:00 in 24-hour time.
15:00 - 10:35 = ?
15:00 minus 10:35:
Borrow 1 hour → 14:60 - 10:35 = 4 hours 25 minutes → same answer.
✔ 4 hours 25 minutes
---
⑤ From 6:00 AM to 11:20 AM
Easy: 6 to 11 is 5 hours, plus 20 minutes → 5 hours 20 minutes
---
⑥ From 5:30 PM to 9:15 PM
5:30 to 6:30 → 1h
6:30 to 7:30 → 1h
7:30 to 8:30 → 1h
8:30 to 9:15 → 45 minutes
Total = 3 hours + 45 minutes = 3 hours 45 minutes
---
⑦ From 11:45 PM to 2:00 PM
This crosses midnight! So we 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 hours, then 12 PM to 2 PM is 2 more → 14 hours)
Wait — 12:00 AM to 2:00 PM is actually 14 hours? Let’s check:
12:00 AM → 12:00 PM = 12 hours
12:00 PM → 2:00 PM = 2 hours → total 14 hours
Plus the first 15 minutes → total = 14 hours 15 minutes
But wait — from 11:45 PM to 2:00 PM next day.
Actually, from 11:45 PM to 12:00 AM = 15 min
Then 12:00 AM to 2:00 PM = 14 hours
So yes → 14 hours 15 minutes
---
⑧ From 1:00 AM to 5:35 AM
Straightforward: 1 to 5 is 4 hours, plus 35 minutes → 4 hours 35 minutes
---
⑨ From 4:10 PM to 9:35 PM
4:10 to 5:10 → 1h
5:10 to 6:10 → 1h
6:10 to 7:10 → 1h
7:10 to 8:10 → 1h
8:10 to 9:10 → 1h → that’s 5 hours so far
Then 9:10 to 9:35 → 25 minutes
Total = 5 hours + 25 minutes = 5 hours 25 minutes
---
⑩ From 6:35 AM to 9:40 AM
6:35 to 7:35 → 1h
7:35 to 8:35 → 1h
8:35 to 9:35 → 1h → 3 hours
Then 9:35 to 9:40 → 5 minutes
Total = 3 hours 5 minutes
---
⑪ From 8:50 AM to 11:40 PM
Again, crosses noon.
From 8:50 AM to 12:00 PM → let’s calculate:
8:50 to 9:50 → 1h
9:50 to 10:50 → 1h
10:50 to 11:50 → 1h → but we only go to 12:00 PM? Wait no — 8:50 AM to 12:00 PM is:
From 8:50 to 12:00 → 3 hours 10 minutes? Let's see:
8:50 to 9:00 → 10 min
9:00 to 12:00 → 3 hours → total 3h 10min
Then from 12:00 PM to 11:40 PM → 11 hours 40 minutes
Wait — 12:00 PM to 11:40 PM is almost 12 hours, but not quite.
Actually, 12:00 PM to 11:40 PM = 11 hours 40 minutes
So total elapsed time:
From 8:50 AM to 12:00 PM = 3 hours 10 minutes
From 12:00 PM to 11:40 PM = 11 hours 40 minutes
Add them: 3h10m + 11h40m = 14 hours 50 minutes
Check: 8:50 AM to 8:50 PM is 12 hours
Then 8:50 PM to 11:40 PM = 2 hours 50 minutes
Total = 12h + 2h50m = 14h50m → same!
✔ 14 hours 50 minutes
---
⑫ From 12:00 AM to 5:46 AM
Simple: 12:00 AM to 5:00 AM = 5 hours
Plus 46 minutes → 5 hours 46 minutes
---
Now let’s list all answers clearly:
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 elasped time worksheet.
