Add and Subtract Time Worksheets - Free Printable

To solve the problems in the image, we need to perform arithmetic operations (addition and subtraction) on time intervals. Let's break down each section step by step.

---

Section A: Add and Subtract Time Intervals (Minutes and Seconds)

#### Part 1: Addition
1. 23 minutes + 25 seconds + 18 minutes + 45 seconds
- Minutes: \( 23 + 18 = 41 \)
- Seconds: \( 25 + 45 = 70 \)
- Since 70 seconds is more than 60 seconds, convert 60 seconds to 1 minute:
- \( 70 \text{ seconds} = 1 \text{ minute} + 10 \text{ seconds} \)
- Add the extra minute to the total minutes:
- \( 41 + 1 = 42 \) minutes
- Final answer: \( 42 \text{ minutes } 10 \text{ seconds} \)

2. 5 minutes + 65 seconds + 1 minute + 35 seconds
- Minutes: \( 5 + 1 = 6 \)
- Seconds: \( 65 + 35 = 100 \)
- Convert 100 seconds to minutes and seconds:
- \( 100 \text{ seconds} = 1 \text{ minute} + 40 \text{ seconds} \)
- Add the extra minute to the total minutes:
- \( 6 + 1 = 7 \) minutes
- Final answer: \( 7 \text{ minutes } 40 \text{ seconds} \)

3. 9 minutes + 30 seconds + 5 minutes + 30 seconds
- Minutes: \( 9 + 5 = 14 \)
- Seconds: \( 30 + 30 = 60 \)
- Convert 60 seconds to 1 minute:
- \( 60 \text{ seconds} = 1 \text{ minute} \)
- Add the extra minute to the total minutes:
- \( 14 + 1 = 15 \) minutes
- Final answer: \( 15 \text{ minutes } 0 \text{ seconds} \)

4. 12 minutes + 45 seconds + 8 minutes + 15 seconds
- Minutes: \( 12 + 8 = 20 \)
- Seconds: \( 45 + 15 = 60 \)
- Convert 60 seconds to 1 minute:
- \( 60 \text{ seconds} = 1 \text{ minute} \)
- Add the extra minute to the total minutes:
- \( 20 + 1 = 21 \) minutes
- Final answer: \( 21 \text{ minutes } 0 \text{ seconds} \)

#### Part 2: Subtraction
1. 25 minutes – 15 seconds – 12 minutes – 45 seconds
- Minutes: \( 25 - 12 = 13 \)
- Seconds: \( 0 - 15 - 45 = -60 \)
- Borrow 1 minute from 13 minutes (convert it to 60 seconds):
- \( 13 \text{ minutes} = 12 \text{ minutes } 60 \text{ seconds} \)
- \( 60 - 15 - 45 = 0 \)
- Final answer: \( 12 \text{ minutes } 0 \text{ seconds} \)

2. 30 minutes – 25 seconds – 15 minutes – 35 seconds
- Minutes: \( 30 - 15 = 15 \)
- Seconds: \( 0 - 25 - 35 = -60 \)
- Borrow 1 minute from 15 minutes (convert it to 60 seconds):
- \( 15 \text{ minutes} = 14 \text{ minutes } 60 \text{ seconds} \)
- \( 60 - 25 - 35 = 0 \)
- Final answer: \( 14 \text{ minutes } 0 \text{ seconds} \)

3. 45 minutes – 30 seconds – 20 minutes – 30 seconds
- Minutes: \( 45 - 20 = 25 \)
- Seconds: \( 0 - 30 - 30 = -60 \)
- Borrow 1 minute from 25 minutes (convert it to 60 seconds):
- \( 25 \text{ minutes} = 24 \text{ minutes } 60 \text{ seconds} \)
- \( 60 - 30 - 30 = 0 \)
- Final answer: \( 24 \text{ minutes } 0 \text{ seconds} \)

4. 60 minutes – 45 seconds – 30 minutes – 15 seconds
- Minutes: \( 60 - 30 = 30 \)
- Seconds: \( 0 - 45 - 15 = -60 \)
- Borrow 1 minute from 30 minutes (convert it to 60 seconds):
- \( 30 \text{ minutes} = 29 \text{ minutes } 60 \text{ seconds} \)
- \( 60 - 45 - 15 = 0 \)
- Final answer: \( 29 \text{ minutes } 0 \text{ seconds} \)

---

Section B: Add and Subtract Time Intervals (Hours and Minutes)

#### Part 1: Addition
1. 1 hour 25 minutes + 2 hours 35 minutes
- Hours: \( 1 + 2 = 3 \)
- Minutes: \( 25 + 35 = 60 \)
- Convert 60 minutes to 1 hour:
- \( 60 \text{ minutes} = 1 \text{ hour} \)
- Add the extra hour to the total hours:
- \( 3 + 1 = 4 \) hours
- Final answer: \( 4 \text{ hours } 0 \text{ minutes} \)

2. 3 hours 45 minutes + 2 hours 15 minutes
- Hours: \( 3 + 2 = 5 \)
- Minutes: \( 45 + 15 = 60 \)
- Convert 60 minutes to 1 hour:
- \( 60 \text{ minutes} = 1 \text{ hour} \)
- Add the extra hour to the total hours:
- \( 5 + 1 = 6 \) hours
- Final answer: \( 6 \text{ hours } 0 \text{ minutes} \)

3. 5 hours 30 minutes + 4 hours 30 minutes
- Hours: \( 5 + 4 = 9 \)
- Minutes: \( 30 + 30 = 60 \)
- Convert 60 minutes to 1 hour:
- \( 60 \text{ minutes} = 1 \text{ hour} \)
- Add the extra hour to the total hours:
- \( 9 + 1 = 10 \) hours
- Final answer: \( 10 \text{ hours } 0 \text{ minutes} \)

4. 7 hours 15 minutes + 3 hours 45 minutes
- Hours: \( 7 + 3 = 10 \)
- Minutes: \( 15 + 45 = 60 \)
- Convert 60 minutes to 1 hour:
- \( 60 \text{ minutes} = 1 \text{ hour} \)
- Add the extra hour to the total hours:
- \( 10 + 1 = 11 \) hours
- Final answer: \( 11 \text{ hours } 0 \text{ minutes} \)

#### Part 2: Subtraction
1. 5 hours 25 minutes – 2 hours 35 minutes
- Hours: \( 5 - 2 = 3 \)
- Minutes: \( 25 - 35 = -10 \)
- Borrow 1 hour from 3 hours (convert it to 60 minutes):
- \( 3 \text{ hours} = 2 \text{ hours } 60 \text{ minutes} \)
- \( 60 + 25 - 35 = 50 \)
- Final answer: \( 2 \text{ hours } 50 \text{ minutes} \)

2. 8 hours 15 minutes – 3 hours 45 minutes
- Hours: \( 8 - 3 = 5 \)
- Minutes: \( 15 - 45 = -30 \)
- Borrow 1 hour from 5 hours (convert it to 60 minutes):
- \( 5 \text{ hours} = 4 \text{ hours } 60 \text{ minutes} \)
- \( 60 + 15 - 45 = 30 \)
- Final answer: \( 4 \text{ hours } 30 \text{ minutes} \)

3. 10 hours 30 minutes – 4 hours 45 minutes
- Hours: \( 10 - 4 = 6 \)
- Minutes: \( 30 - 45 = -15 \)
- Borrow 1 hour from 6 hours (convert it to 60 minutes):
- \( 6 \text{ hours} = 5 \text{ hours } 60 \text{ minutes} \)
- \( 60 + 30 - 45 = 45 \)
- Final answer: \( 5 \text{ hours } 45 \text{ minutes} \)

4. 12 hours 45 minutes – 5 hours 55 minutes
- Hours: \( 12 - 5 = 7 \)
- Minutes: \( 45 - 55 = -10 \)
- Borrow 1 hour from 7 hours (convert it to 60 minutes):
- \( 7 \text{ hours} = 6 \text{ hours } 60 \text{ minutes} \)
- \( 60 + 45 - 55 = 50 \)
- Final answer: \( 6 \text{ hours } 50 \text{ minutes} \)

---

Section C: Add and Subtract Time Intervals (Days, Weeks, Months, and Years)

#### Part 1: Addition
1. 6 weeks 4 days + 3 weeks 5 days
- Weeks: \( 6 + 3 = 9 \)
- Days: \( 4 + 5 = 9 \)
- Convert 7 days to 1 week:
- \( 9 \text{ days} = 1 \text{ week } 2 \text{ days} \)
- Add the extra week to the total weeks:
- \( 9 + 1 = 10 \) weeks
- Final answer: \( 10 \text{ weeks } 2 \text{ days} \)

2. 4 months 15 days + 3 months 25 days
- Months: \( 4 + 3 = 7 \)
- Days: \( 15 + 25 = 40 \)
- Convert 30 days to 1 month:
- \( 40 \text{ days} = 1 \text{ month } 10 \text{ days} \)
- Add the extra month to the total months:
- \( 7 + 1 = 8 \) months
- Final answer: \( 8 \text{ months } 10 \text{ days} \)

3. 2 years 9 months + 1 year 11 months
- Years: \( 2 + 1 = 3 \)
- Months: \( 9 + 11 = 20 \)
- Convert 12 months to 1 year:
- \( 20 \text{ months} = 1 \text{ year } 8 \text{ months} \)
- Add the extra year to the total years:
- \( 3 + 1 = 4 \) years
- Final answer: \( 4 \text{ years } 8 \text{ months} \)

4. 5 years 6 months + 3 years 9 months
- Years: \( 5 + 3 = 8 \)
- Months: \( 6 + 9 = 15 \)
- Convert 12 months to 1 year:
- \( 15 \text{ months} = 1 \text{ year } 3 \text{ months} \)
- Add the extra year to the total years:
- \( 8 + 1 = 9 \) years
- Final answer: \( 9 \text{ years } 3 \text{ months} \)

#### Part 2: Subtraction
1. 8 weeks 5 days – 3 weeks 7 days
- Weeks: \( 8 - 3 = 5 \)
- Days: \( 5 - 7 = -2 \)
- Borrow 1 week from 5 weeks (convert it to 7 days):
- \( 5 \text{ weeks} = 4 \text{ weeks } 7 \text{ days} \)
- \( 7 + 5 - 7 = 5 \)
- Final answer: \( 4 \text{ weeks } 5 \text{ days} \)

2. 7 months 20 days – 4 months 25 days
- Months: \( 7 - 4 = 3 \)
- Days: \( 20 - 25 = -5 \)
- Borrow 1 month from 3 months (convert it to 30 days):
- \( 3 \text{ months} = 2 \text{ months } 30 \text{ days} \)
- \( 30 + 20 - 25 = 25 \)
- Final answer: \( 2 \text{ months } 25 \text{ days} \)

3. 4 years 7 months – 2 years 9 months
- Years: \( 4 - 2 = 2 \)
- Months: \( 7 - 9 = -2 \)
- Borrow 1 year from 2 years (convert it to 12 months):
- \( 2 \text{ years} = 1 \text{ year } 12 \text{ months} \)
- \( 12 + 7 - 9 = 10 \)
- Final answer: \( 1 \text{ year } 10 \text{ months} \)

4. 6 years 3 months – 3 years 8 months
- Years: \( 6 - 3 = 3 \)
- Months: \( 3 - 8 = -5 \)
- Borrow 1 year from 3 years (convert it to 12 months):
- \( 3 \text{ years} = 2 \text{ years } 12 \text{ months} \)
- \( 12 + 3 - 8 = 7 \)
- Final answer: \( 2 \text{ years } 7 \text{ months} \)

---

Final Answers

Section A:
1. \( 42 \text{ minutes } 10 \text{ seconds} \)
2. \( 7 \text{ minutes } 40 \text{ seconds} \)
3. \( 15 \text{ minutes } 0 \text{ seconds} \)
4. \( 21 \text{ minutes } 0 \text{ seconds} \)
5. \( 12 \text{ minutes } 0 \text{ seconds} \)
6. \( 14 \text{ minutes } 0 \text{ seconds} \)
7. \( 24 \text{ minutes } 0 \text{ seconds} \)
8. \( 29 \text{ minutes } 0 \text{ seconds} \)

Section B:
1. \( 4 \text{ hours } 0 \text{ minutes} \)
2. \( 6 \text{ hours } 0 \text{ minutes} \)
3. \( 10 \text{ hours } 0 \text{ minutes} \)
4. \( 11 \text{ hours } 0 \text{ minutes} \)
5. \( 2 \text{ hours } 50 \text{ minutes} \)
6. \( 4 \text{ hours } 30 \text{ minutes} \)
7. \( 5 \text{ hours } 45 \text{ minutes} \)
8. \( 6 \text{ hours } 50 \text{ minutes} \)

Section C:
1. \( 10 \text{ weeks } 2 \text{ days} \)
2. \( 8 \text{ months } 10 \text{ days} \)
3. \( 4 \text{ years } 8 \text{ months} \)
4. \( 9 \text{ years } 3 \text{ months} \)
5. \( 4 \text{ weeks } 5 \text{ days} \)
6. \( 2 \text{ months } 25 \text{ days} \)
7. \( 1 \text{ year } 10 \text{ months} \)
8. \( 2 \text{ years } 7 \text{ months} \)

Boxed Final Answer:
\[
\boxed{
\begin{array}{l}
\text{Section A:} \\
1. 42 \text{ minutes } 10 \text{ seconds} \\
2. 7 \text{ minutes } 40 \text{ seconds} \\
3. 15 \text{ minutes } 0 \text{ seconds} \\
4. 21 \text{ minutes } 0 \text{ seconds} \\
5. 12 \text{ minutes } 0 \text{ seconds} \\
6. 14 \text{ minutes } 0 \text{ seconds} \\
7. 24 \text{ minutes } 0 \text{ seconds} \\
8. 29 \text{ minutes } 0 \text{ seconds} \\
\\
\text{Section B:} \\
1. 4 \text{ hours } 0 \text{ minutes} \\
2. 6 \text{ hours } 0 \text{ minutes} \\
3. 10 \text{ hours } 0 \text{ minutes} \\
4. 11 \text{ hours } 0 \text{ minutes} \\
5. 2 \text{ hours } 50 \text{ minutes} \\
6. 4 \text{ hours } 30 \text{ minutes} \\
7. 5 \text{ hours } 45 \text{ minutes} \\
8. 6 \text{ hours } 50 \text{ minutes} \\
\\
\text{Section C:} \\
1. 10 \text{ weeks } 2 \text{ days} \\
2. 8 \text{ months } 10 \text{ days} \\
3. 4 \text{ years } 8 \text{ months} \\
4. 9 \text{ years } 3 \text{ months} \\
5. 4 \text{ weeks } 5 \text{ days} \\
6. 2 \text{ months } 25 \text{ days} \\
7. 1 \text{ year } 10 \text{ months} \\
8. 2 \text{ years } 7 \text{ months} \\
\end{array}
}
\]