Here are the step-by-step solutions for each problem on the worksheet.
1. 01:10 + 22:13
*
Minutes: $10 + 13 = 23$ minutes.
*
Hours: $1 + 22 = 23$ hours.
*
Result: 23:23
2. 42:38 - 25:02
*
Minutes: $38 - 2 = 36$ minutes.
*
Hours: $42 - 25 = 17$ hours.
*
Result: 17:36
3. 25:12 + 23:21
*
Minutes: $12 + 21 = 33$ minutes.
*
Hours: $25 + 23 = 48$ hours.
*
Result: 48:33
4. 31:31 - 21:27
*
Minutes: You cannot subtract 27 from 31 directly without borrowing? Actually, you can: $31 - 27 = 4$. So, 04 minutes.
*
Hours: Since we didn't borrow from the hours, it is just $31 - 21 = 10$ hours.
*
Result: 10:04
5. 08:54 + 18:59
*
Minutes: $54 + 59 = 113$ minutes. Since 60 minutes make an hour, 113 minutes is 1 hour and 53 minutes. Write down 53 and carry over the 1 hour.
*
Hours: $8 + 18 = 26$ hours. Add the 1 carried hour: $26 + 1 = 27$ hours.
*
Result: 27:53
6. 35:59 - 14:57
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Minutes: $59 - 57 = 2$ minutes.
*
Hours: $35 - 14 = 21$ hours.
*
Result: 21:02
7. 01:50 + 11:26
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Minutes: $50 + 26 = 76$ minutes. This is 1 hour and 16 minutes. Write down 16 and carry over the 1 hour.
*
Hours: $1 + 11 = 12$ hours. Add the 1 carried hour: $12 + 1 = 13$ hours.
*
Result: 13:16
8. 23:50 - 09:35
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Minutes: $50 - 35 = 15$ minutes.
*
Hours: $23 - 9 = 14$ hours.
*
Result: 14:15
9. 20:02 + 10:31
*
Minutes: $2 + 31 = 33$ minutes.
*
Hours: $20 + 10 = 30$ hours.
*
Result: 30:33
10. 30:52 - 22:23
*
Minutes: You cannot take 3 from 2. Borrow 1 hour (60 minutes) from the 30 hours. The minutes become $60 + 52 = 112$? No, simpler way: Take 1 from 30 to make it 29. Add 60 to 52 to get 112? No, standard subtraction:
* Borrow 1 hour from 30, leaving 29 hours.
* Add 60 minutes to 52, making it 112 minutes? No, just add 60 to the top minutes digit if it's smaller.
* Let's do it simply: $52 - 23$. $12 - 3 = 9$. $4 - 2 = 2$. So, 29 minutes.
* Hours: We borrowed 1, so $29 - 22 = 7$? Wait. Let's re-calculate carefully.
* $30:52 - 22:23$.
* Minutes column: $2 < 3$, so borrow from hours. 30 becomes 29. 52 becomes $52 + 60 = 112$? No, that's not how time subtraction usually works in these drills unless converting everything.
* Let's stick to base 60 logic.
* Minutes: $52 - 23$. $52 - 20 = 32$. $32 - 3 = 29$. So, 29 minutes. (No borrowing needed for the final result digits, but logically $52 > 23$ so no hour borrowing is actually required for the minutes part alone? Yes, 52 is bigger than 23. My bad. Simple subtraction: $52 - 23 = 29$).
* Hours: $30 - 22 = 8$.
* Result: 08:29.
Final Answer:
1. 23:23
2. 17:36
3. 48:33
4. 10:04
5. 27:53
6. 21:02
7. 13:16
8. 14:15
9. 30:33
10. 08:29
Parent Tip: Review the logic above to help your child master the concept of adding and subtracting time worksheet.
