Let's solve each of the
adding and subtracting time problems step by step.
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Problem 1:
11 hr 34 min
+
5 hr 30 min
Add hours and minutes separately:
- Hours: 11 + 5 =
16 hr
- Minutes: 34 + 30 =
64 min
But 64 minutes is more than 60, so convert:
- 64 min = 1 hr 4 min
- Add 1 hour to total hours: 16 + 1 =
17 hr
- Remaining minutes:
4 min
✔ Answer: 17 hr 4 min
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Problem 2:
09 hr 40 min
−
03 hr 45 min
We can't subtract 45 min from 40 min, so borrow 1 hour (60 minutes) from 9 hours:
- 9 hr → 8 hr
- 40 min → 40 + 60 =
100 min
Now subtract:
- Hours: 8 − 3 =
5 hr
- Minutes: 100 − 45 =
55 min
✔ Answer: 5 hr 55 min
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Problem 3:
12 hr 55 min
−
10 hr 05 min
Subtract directly:
- Hours: 12 − 10 =
2 hr
- Minutes: 55 − 5 =
50 min
✔ Answer: 2 hr 50 min
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Problem 4:
17 hr 17 min
−
2 hr 5 min
Subtract:
- Hours: 17 − 2 =
15 hr
- Minutes: 17 − 5 =
12 min
✔ Answer: 15 hr 12 min
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Problem 5:
7 hr 48 min
+
3 hr 40 min
Add:
- Hours: 7 + 3 =
10 hr
- Minutes: 48 + 40 =
88 min
Convert 88 min:
- 88 min = 1 hr 28 min
- Add 1 hour: 10 + 1 =
11 hr
- Remaining minutes:
28 min
✔ Answer: 11 hr 28 min
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Problem 6:
9 hr 20 min
−
5 hr 15 min
Subtract:
- Hours: 9 − 5 =
4 hr
- Minutes: 20 − 15 =
5 min
✔ Answer: 4 hr 5 min
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Problem 7:
2 hr 59 min
−
1 hr 20 min
Subtract:
- Hours: 2 − 1 =
1 hr
- Minutes: 59 − 20 =
39 min
✔ Answer: 1 hr 39 min
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Problem 8:
19 hr 33 min
+
8 hr 8 min
Add:
- Hours: 19 + 8 =
27 hr
- Minutes: 33 + 8 =
41 min
✔ Answer: 27 hr 41 min
(Note: This is over a full day — 24 hours. If you're working in a 24-hour format, it would be 27:41, but unless specified, we just leave it as is.)
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✔ Final Answers:
| Problem | Answer |
|--------|------------------|
| 1 | 17 hr 4 min |
| 2 | 5 hr 55 min |
| 3 | 2 hr 50 min |
| 4 | 15 hr 12 min |
| 5 | 11 hr 28 min |
| 6 | 4 hr 5 min |
| 7 | 1 hr 39 min |
| 8 | 27 hr 41 min |
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Let me know if you'd like these answers formatted for printing or need help with any specific step!
Parent Tip: Review the logic above to help your child master the concept of adding and subtracting time worksheet.
