Let's solve each problem step by step.
---
1) 7 hours 59 minutes
+ 3 hours 10 minutes
- Add the hours: 7 + 3 =
10 hours
- Add the minutes: 59 + 10 =
69 minutes
- But 69 minutes = 1 hour 9 minutes
- So, add that extra hour to the total hours: 10 + 1 =
11 hours
- Final answer:
11 hours 9 minutes
✔ Answer: 11 hours 9 minutes
---
2) 19 hours 9 minutes
– 1 hour 42 minutes
- Subtract hours: 19 – 1 =
18 hours
- Subtract minutes: 9 – 42 → can't do (9 < 42), so borrow 1 hour (60 minutes)
- Convert 1 hour to 60 minutes: 18 hours becomes 17 hours, and 9 minutes becomes 60 + 9 =
69 minutes
- Now subtract: 69 – 42 =
27 minutes
- Hours: 17
- Final answer:
17 hours 27 minutes
✔ Answer: 17 hours 27 minutes
---
3) 18 hours 6 minutes
– 13 hours 25 minutes
- Subtract hours: 18 – 13 =
5 hours
- Subtract minutes: 6 – 25 → can't do, so borrow 1 hour (60 minutes)
- 18 hours → 17 hours, 6 minutes → 60 + 6 =
66 minutes
- Now: 66 – 25 =
41 minutes
- Hours: 17 – 13 =
4 hours
- Final answer:
4 hours 41 minutes
✔ Answer: 4 hours 41 minutes
---
4) 2 hours 38 minutes
+ 20 hours 33 minutes
- Add hours: 2 + 20 =
22 hours
- Add minutes: 38 + 33 =
71 minutes
- 71 minutes = 1 hour 11 minutes
- Add to hours: 22 + 1 =
23 hours
- Minutes:
11 minutes
- Final answer:
23 hours 11 minutes
✔ Answer: 23 hours 11 minutes
---
5) 5 hours 40 minutes
+ 12 hours 52 minutes
- Add hours: 5 + 12 =
17 hours
- Add minutes: 40 + 52 =
92 minutes
- 92 minutes = 1 hour 32 minutes
- Add to hours: 17 + 1 =
18 hours
- Minutes:
32 minutes
- Final answer:
18 hours 32 minutes
✔ Answer: 18 hours 32 minutes
---
6) 6 hours 17 minutes
– 3 hours 27 minutes
- Subtract hours: 6 – 3 =
3 hours
- Subtract minutes: 17 – 27 → can't do, so borrow 1 hour
- 6 hours → 5 hours, 17 minutes → 60 + 17 =
77 minutes
- Now: 77 – 27 =
50 minutes
- Hours: 5 – 3 =
2 hours
- Final answer:
2 hours 50 minutes
✔ Answer: 2 hours 50 minutes
---
7) Allen took 2 hours 15 minutes to complete his science project. If he completed his art project in 3 hours 49 minutes, how long did he spend on his project altogether?
We need to
add both times:
- Science: 2 hours 15 minutes
- Art: 3 hours 49 minutes
Add:
- Hours: 2 + 3 =
5 hours
- Minutes: 15 + 49 =
64 minutes
- 64 minutes = 1 hour 4 minutes
- Add to hours: 5 + 1 =
6 hours
- Minutes:
4 minutes
✔ Answer: 6 hours 4 minutes
---
✔ Final Answers:
1)
11 hours 9 minutes
2)
17 hours 27 minutes
3)
4 hours 41 minutes
4)
23 hours 11 minutes
5)
18 hours 32 minutes
6)
2 hours 50 minutes
7)
6 hours 4 minutes
Let me know if you'd like a printable version or explanation in another format!
Parent Tip: Review the logic above to help your child master the concept of timed subtraction worksheet 2nd.
