Decimal place value worksheet for students to practice identifying the value of the digit 8 and performing addition, provided by MathCenter.

Problem Analysis:

The task involves two main parts for each given number:
1. Identify the value of the digit 8 in the number.
2. Add 12 to the number and write the result.

We will solve this step by step for each number provided.

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Step-by-Step Solution:

#### Number: 3,008
1. Value of 8:
- The digit 8 is in the ones place.
- Therefore, the value of 8 is \( 8 \times 1 = 8 \).

2. Sum of the number + 12:
- Add 12 to 3,008:
\[
3,008 + 12 = 3,020
\]

#### Number: 5,998
1. Value of 8:
- The digit 8 is in the ones place.
- Therefore, the value of 8 is \( 8 \times 1 = 8 \).

2. Sum of the number + 12:
- Add 12 to 5,998:
\[
5,998 + 12 = 6,010
\]

#### Number: 6,809
1. Value of 8:
- The digit 8 is in the hundreds place.
- Therefore, the value of 8 is \( 8 \times 100 = 800 \).

2. Sum of the number + 12:
- Add 12 to 6,809:
\[
6,809 + 12 = 6,821
\]

#### Number: 8,008
1. Value of 8:
- There are two 8s in this number:
- The first 8 is in the thousands place, with a value of \( 8 \times 1,000 = 8,000 \).
- The second 8 is in the ones place, with a value of \( 8 \times 1 = 8 \).
- Since the question asks for the value of the digit 8, we consider both places:
- Value of the 8 in the thousands place: \( 8,000 \)
- Value of the 8 in the ones place: \( 8 \)

2. Sum of the number + 12:
- Add 12 to 8,008:
\[
8,008 + 12 = 8,020
\]

#### Number: 9,989
1. Value of 8:
- The digit 8 is in the tens place.
- Therefore, the value of 8 is \( 8 \times 10 = 80 \).

2. Sum of the number + 12:
- Add 12 to 9,989:
\[
9,989 + 12 = 10,001
\]

#### Number: 9,889
1. Value of 8:
- There are two 8s in this number:
- The first 8 is in the hundreds place, with a value of \( 8 \times 100 = 800 \).
- The second 8 is in the tens place, with a value of \( 8 \times 10 = 80 \).
- Since the question asks for the value of the digit 8, we consider both places:
- Value of the 8 in the hundreds place: \( 800 \)
- Value of the 8 in the tens place: \( 80 \)

2. Sum of the number + 12:
- Add 12 to 9,889:
\[
9,889 + 12 = 9,901
\]

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Final Answer:

\[
\begin{array}{|c|c|c|}
\hline
\text{Number} & \text{Value of 8} & \text{Sum of the number + 12} \\
\hline
3,008 & 8 & 3,020 \\
5,998 & 8 & 6,010 \\
6,809 & 800 & 6,821 \\
8,008 & 8,000 \text{ or } 8 & 8,020 \\
9,989 & 80 & 10,001 \\
9,889 & 800 \text{ or } 80 & 9,901 \\
\hline
\end{array}
\]

\boxed{
\begin{array}{|c|c|c|}
\hline
\text{Number} & \text{Value of 8} & \text{Sum of the number + 12} \\
\hline
3,008 & 8 & 3,020 \\
5,998 & 8 & 6,010 \\
6,809 & 800 & 6,821 \\
8,008 & 8,000 \text{ or } 8 & 8,020 \\
9,989 & 80 & 10,001 \\
9,889 & 800 \text{ or } 80 & 9,901 \\
\hline
\end{array}
}