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To convert the decimal number \( 89 \) to base \( 8 \), we perform repeated division by \( 8 \), tracking the remainders.

1. **Divide \( 89 \) by \( 8 \):**
   \[
   89 \div 8 = 11 \text{ with a remainder of } 1
   \]
   So, the least significant digit is \( 1 \).

2. **Divide \( 11 \) by \( 8 \):**
   \[
   11 \div 8 = 1 \text{ with a remainder of } 3
   \]
   The next digit is \( 3 \).

3. **Divide \( 1 \) by \( 8 \):**
   \[
   1 \div 8 = 0 \text{ with a remainder of } 1
   \]
   The most significant digit is \( 1 \).

So, \( 89 \) in base \( 8 \) is written as **131**.

### Answer:
The correct answer is **131**.

Would you like more details, or do you have any other questions?

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Here are some related questions to explore:

1. How would you convert other numbers from base 10 to base 8?
2. How does converting a number from decimal to a base other than 10 work?
3. What would be the base 8 representation of a number like 100 in base 10?
4. How do you convert a number from one base directly to another, such as from base 8 to base 16?
5. What are some practical applications of using different number bases?

**Tip:** When converting a decimal number to a different base, remember to divide by the base and track the remainders for each step. The remainders form the digits of the new base, starting from the least significant.

Learn how to convert the decimal number 89 to base 8 with a step-by-step solution, including repeated division and remainders. This problem helps students understand number base conversion and is suitable for Grades 6-8.

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