Calculating intervals of time differentiated worksheets | Teaching ... - Free Printable

Let's solve each of these time interval problems step by step, showing the working clearly.

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1) Amy left the house for a jog at 10:20 am and returned at 11:05 am. How long was her jog?

Step 1: Start time = 10:20 am
End time = 11:05 am

Step 2: Subtract start time from end time:

From 10:20 to 11:00 is 40 minutes
From 11:00 to 11:05 is 5 minutes

Total = 40 + 5 = 45 minutes

✔ Answer: 45 minutes

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2) Ben had so much homework to do after school, he started at 3:10 pm but didn't finish until 6:40 pm. How long did it take him?

Step 1: Start time = 3:10 pm
End time = 6:40 pm

Step 2: Break it into parts:

- From 3:10 pm to 4:10 pm = 1 hour
- From 4:10 pm to 5:10 pm = 1 hour
- From 5:10 pm to 6:10 pm = 1 hour
- From 6:10 pm to 6:40 pm = 30 minutes

Total = 3 hours + 30 minutes = 3 hours 30 minutes

✔ Answer: 3 hours 30 minutes

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3) Callum had his breakfast at 07:15 am, his lunch at 12:30 pm and his tea at 5:05 pm. How long was it between his breakfast and tea?

We need the time from 07:15 am to 5:05 pm

Step 1: Convert both times to 24-hour format:
- Breakfast: 07:15
- Tea: 17:05 (since 5:05 pm = 17:05)

Step 2: Subtract:
17:05 – 07:15

Break it down:

- From 07:15 to 17:15 = 10 hours
- But we only go to 17:05, which is 10 minutes less

So: 10 hours – 10 minutes = 9 hours 50 minutes

✔ Answer: 9 hours 50 minutes

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4) Doreen went to bed at 8:30 pm and woke up one hour after 5:20 am. How long was she in bed for?

Step 1: She went to bed at 8:30 pm
She woke up one hour after 5:20 am, so wake-up time = 6:20 am

Now calculate time from 8:30 pm to 6:20 am

Step 2: Break into two parts:

- From 8:30 pm to midnight (12:00 am) = 3 hours 30 minutes
(Because 12:00 – 8:30 = 3h 30m)

- From midnight (12:00 am) to 6:20 am = 6 hours 20 minutes

Add them:
3h 30m + 6h 20m = 9 hours 50 minutes

✔ Answer: 9 hours 50 minutes

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5) Elinor stayed at her grandma's. She arrived on Thursday at 17:25 and left on Friday at 14:15. How long was her stay?

Step 1: Arrival: Thursday 17:25
Departure: Friday 14:15

We need to find the time between these two points.

Step 2: Break it into parts:

- From Thursday 17:25 to Friday 17:25 = 24 hours
- But she left at 14:15, which is 3 hours 10 minutes before 17:25

So subtract 3h 10m from 24h:

24 hours – 3 hours 10 minutes = 20 hours 50 minutes

✔ Answer: 20 hours 50 minutes

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6) Francis only managed to fall asleep at 00:05 and then slept through his 08:30 alarm. He only woke up 2 hours 30 minutes later. What time did he eventually wake up?

Step 1: He fell asleep at 00:05 (midnight)
He slept past 08:30, and woke up 2 hours 30 minutes after 08:30

Step 2: Add 2h 30m to 08:30:

08:30 + 2 hours = 10:30
10:30 + 30 minutes = 11:00

✔ Answer: 11:00 am

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✔ Final Answers:

1) 45 minutes
2) 3 hours 30 minutes
3) 9 hours 50 minutes
4) 9 hours 50 minutes
5) 20 hours 50 minutes
6) 11:00 am

Let me know if you'd like a visual timeline or explanation for any of them!