Here are the step-by-step solutions for each problem on the worksheet.
1. 13 hr 34 min + 25 hr 25 min
*
Minutes: $34 + 25 = 59$ minutes.
*
Hours: $13 + 25 = 38$ hours.
*
Result: 38 hr 59 min
2. 18 hr 43 min – 07 hr 03 min
*
Minutes: $43 - 3 = 40$ minutes.
*
Hours: $18 - 7 = 11$ hours.
*
Result: 11 hr 40 min
3. 12 hr 04 min + 13 hr 41 min
*
Minutes: $4 + 41 = 45$ minutes.
*
Hours: $12 + 13 = 25$ hours.
*
Result: 25 hr 45 min
4. 19 hr 47 min – 16 hr 41 min
*
Minutes: $47 - 41 = 6$ minutes. (Write as 06)
*
Hours: $19 - 16 = 3$ hours. (Write as 03)
*
Result: 03 hr 06 min
5. 04 hr 43 min + 16 hr 36 min
*
Minutes: $43 + 36 = 79$ minutes. Since 79 is more than 60, we convert it: $79 - 60 = 19$ minutes, and carry over 1 hour.
*
Hours: $4 + 16 = 20$. Add the carried over hour: $20 + 1 = 21$ hours.
*
Result: 21 hr 19 min
6. 21 hr 30 min – 07 hr 13 min
*
Minutes: You cannot subtract 13 from 30 easily? Actually you can. $30 - 13 = 17$ minutes.
*
Hours: $21 - 7 = 14$ hours.
*
Result: 14 hr 17 min
7. 09 hr 57 min + 16 hr 39 min
*
Minutes: $57 + 39 = 96$ minutes. Convert this: $96 - 60 = 36$ minutes, carry over 1 hour.
*
Hours: $9 + 16 = 25$. Add the carried over hour: $25 + 1 = 26$ hours.
*
Result: 26 hr 36 min
8. 17 hr 46 min – 08 hr 43 min
*
Minutes: $46 - 43 = 3$ minutes. (Write as 03)
*
Hours: $17 - 8 = 9$ hours. (Write as 09)
*
Result: 09 hr 03 min
9. 13 hr 58 min + 17 hr 06 min
*
Minutes: $58 + 6 = 64$ minutes. Convert this: $64 - 60 = 4$ minutes, carry over 1 hour.
*
Hours: $13 + 17 = 30$. Add the carried over hour: $30 + 1 = 31$ hours.
*
Result: 31 hr 04 min
10. 43 hr 44 min – 20 hr 46 min
*
Minutes: You cannot subtract 46 from 44. You must borrow 1 hour from the hours column.
* Change 43 hours to 42 hours.
* Add 60 minutes to the 44 minutes: $44 + 60 = 104$ minutes.
* Now subtract: $104 - 46 = 58$ minutes.
*
Hours: Subtract the remaining hours: $42 - 20 = 22$ hours.
*
Result: 22 hr 58 min
Final Answer:
1. 38 hr 59 min
2. 11 hr 40 min
3. 25 hr 45 min
4. 03 hr 06 min
5. 21 hr 19 min
6. 14 hr 17 min
7. 26 hr 36 min
8. 09 hr 03 min
9. 31 hr 04 min
10. 22 hr 58 min
Parent Tip: Review the logic above to help your child master the concept of addition of time worksheet.
