Convert time between hours and minutes with this Grade 3 math worksheet from K5 Learning.

The task involves converting time between hours and minutes. Here's how to solve each problem step by step:

Key Conversion Facts:

1. 1 hour = 60 minutes
2. To convert minutes to hours, divide by 60.
3. To convert hours to minutes, multiply by 60.

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Problem Solutions:

#### 1. \( 60 \text{ min} = \_\_\_ \text{hr} \)
- Solution:
Since \( 1 \text{ hour} = 60 \text{ minutes} \),
\( 60 \text{ min} = 1 \text{ hr} \).

#### 2. \( 1 \text{ hr} = \_\_\_ \text{min} \)
- Solution:
Since \( 1 \text{ hour} = 60 \text{ minutes} \),
\( 1 \text{ hr} = 60 \text{ min} \).

#### 3. \( 3 \text{ hr} = \_\_\_ \text{min} \)
- Solution:
Multiply the number of hours by 60:
\( 3 \times 60 = 180 \).
\( 3 \text{ hr} = 180 \text{ min} \).

#### 4. \( 240 \text{ min} = \_\_\_ \text{hr} \)
- Solution:
Divide the number of minutes by 60:
\( 240 \div 60 = 4 \).
\( 240 \text{ min} = 4 \text{ hr} \).

#### 5. \( 5 \text{ hr} = \_\_\_ \text{min} \)
- Solution:
Multiply the number of hours by 60:
\( 5 \times 60 = 300 \).
\( 5 \text{ hr} = 300 \text{ min} \).

#### 6. \( 90 \text{ min} = \_\_\_ \text{hr} \)
- Solution:
Divide the number of minutes by 60:
\( 90 \div 60 = 1.5 \).
\( 90 \text{ min} = 1.5 \text{ hr} \).

#### 7. \( 12 \text{ hr} = \_\_\_ \text{min} \)
- Solution:
Multiply the number of hours by 60:
\( 12 \times 60 = 720 \).
\( 12 \text{ hr} = 720 \text{ min} \).

#### 8. \( 330 \text{ min} = \_\_\_ \text{hr} \)
- Solution:
Divide the number of minutes by 60:
\( 330 \div 60 = 5.5 \).
\( 330 \text{ min} = 5.5 \text{ hr} \).

#### 9. \( 615 \text{ min} = \_\_\_ \text{hr} \)
- Solution:
Divide the number of minutes by 60:
\( 615 \div 60 = 10.25 \).
\( 615 \text{ min} = 10.25 \text{ hr} \).

#### 10. \( 79 \text{ min} = \_\_\_ \text{hr} \)
- Solution:
Divide the number of minutes by 60:
\( 79 \div 60 = 1.3167 \) (approximately).
\( 79 \text{ min} = 1.32 \text{ hr} \) (rounded to two decimal places).

#### 11. \( 24 \text{ hr} = \_\_\_ \text{min} \)
- Solution:
Multiply the number of hours by 60:
\( 24 \times 60 = 1440 \).
\( 24 \text{ hr} = 1440 \text{ min} \).

#### 12. \( 45 \text{ min} = \_\_\_ \text{hr} \)
- Solution:
Divide the number of minutes by 60:
\( 45 \div 60 = 0.75 \).
\( 45 \text{ min} = 0.75 \text{ hr} \).

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Final Answers:

1. \( 60 \text{ min} = 1 \text{ hr} \)
2. \( 1 \text{ hr} = 60 \text{ min} \)
3. \( 3 \text{ hr} = 180 \text{ min} \)
4. \( 240 \text{ min} = 4 \text{ hr} \)
5. \( 5 \text{ hr} = 300 \text{ min} \)
6. \( 90 \text{ min} = 1.5 \text{ hr} \)
7. \( 12 \text{ hr} = 720 \text{ min} \)
8. \( 330 \text{ min} = 5.5 \text{ hr} \)
9. \( 615 \text{ min} = 10.25 \text{ hr} \)
10. \( 79 \text{ min} = 1.32 \text{ hr} \)
11. \( 24 \text{ hr} = 1440 \text{ min} \)
12. \( 45 \text{ min} = 0.75 \text{ hr} \)

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Boxed Final Answer:

\[
\boxed{
\begin{aligned}
1. & \ 1 \text{ hr} \\
2. & \ 60 \text{ min} \\
3. & \ 180 \text{ min} \\
4. & \ 4 \text{ hr} \\
5. & \ 300 \text{ min} \\
6. & \ 1.5 \text{ hr} \\
7. & \ 720 \text{ min} \\
8. & \ 5.5 \text{ hr} \\
9. & \ 10.25 \text{ hr} \\
10. & \ 1.32 \text{ hr} \\
11. & \ 1440 \text{ min} \\
12. & \ 0.75 \text{ hr}
\end{aligned}
}
\]