Adding and Subtracting Time interactive worksheet - Free Printable

Let's solve each problem step by step.

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1. Add the following times:

#### a) 4hr 15min
+ 3hr 20min

Step-by-step:
- Add hours: 4 + 3 = 7 hours
- Add minutes: 15 + 20 = 35 minutes
✔ Answer: 7hr 35min

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#### b) 6hr 25min
+ 3hr 30min

- Hours: 6 + 3 = 9 hours
- Minutes: 25 + 30 = 55 minutes
✔ Answer: 9hr 55min

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#### c) 3hr 35min
+ 2hr 35min

- Hours: 3 + 2 = 5 hours
- Minutes: 35 + 35 = 70 minutes
But 70 minutes = 1 hour 10 minutes
So, add 1 hour to the total hours: 5 + 1 = 6 hours
Remaining minutes: 10
✔ Answer: 6hr 10min

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#### d) 8hr 45min
+ 5hr 55min

- Hours: 8 + 5 = 13 hours
- Minutes: 45 + 55 = 100 minutes
100 minutes = 1 hour 40 minutes
Add 1 hour to hours: 13 + 1 = 14 hours
Remaining minutes: 40
✔ Answer: 14hr 40min

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2. Subtract the following times:

#### a) 6hr 57min
- 2hr 35min

- Hours: 6 - 2 = 4 hours
- Minutes: 57 - 35 = 22 minutes
✔ Answer: 4hr 22min

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#### b) 7hr 48min
- 4hr 37min

- Hours: 7 - 4 = 3 hours
- Minutes: 48 - 37 = 11 minutes
✔ Answer: 3hr 11min

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#### c) 9hr 25min
- 5hr 45min

Here, 25 minutes < 45 minutes → need to borrow 1 hour from 9 hours

- Borrow 1 hour (which is 60 minutes):
So, 9hr 25min becomes 8hr 85min (since 25 + 60 = 85)

Now subtract:
- Hours: 8 - 5 = 3 hours
- Minutes: 85 - 45 = 40 minutes
✔ Answer: 3hr 40min

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#### d) 11hr 12min
- 1hr 54min

Again, 12 minutes < 54 minutes → borrow 1 hour

- Borrow 1 hour: 11hr 12min → 10hr 72min (12 + 60 = 72)

Now subtract:
- Hours: 10 - 1 = 9 hours
- Minutes: 72 - 54 = 18 minutes
✔ Answer: 9hr 18min

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✔ Final Answers:

#### 1. Addition:
a) 7hr 35min
b) 9hr 55min
c) 6hr 10min
d) 14hr 40min

#### 2. Subtraction:
a) 4hr 22min
b) 3hr 11min
c) 3hr 40min
d) 9hr 18min

Let me know if you'd like this explained visually or with diagrams!