It seems like some of the numbers you've provided are not valid octal numbers. Octal numbers use only the digits 0-7. Here are the valid ones:

1. **75 (valid octal)**
2. **64 (valid octal)**
3. **54 (valid octal)**

The numbers **89** and **79** are not valid in octal format because they contain the digits 8 and 9, which are not allowed in octal notation.

I'll convert the valid octal numbers to decimal:

1. **75 (octal)**  
   \(7 \times 8^1 + 5 \times 8^0 = 56 + 5 = 61\)  
   **Decimal:** 61

2. **64 (octal)**  
   \(6 \times 8^1 + 4 \times 8^0 = 48 + 4 = 52\)  
   **Decimal:** 52

3. **54 (octal)**  
   \(5 \times 8^1 + 4 \times 8^0 = 40 + 4 = 44\)  
   **Decimal:** 44

If you need help with any other conversion or have any questions, feel free to ask.

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Here are 5 related questions:

1. How do you convert a decimal number to octal?
2. What are some applications of octal numbers in computing?
3. How do you convert binary numbers to octal?
4. Can you explain the difference between octal and hexadecimal systems?
5. What are the steps to manually convert a decimal number to octal?

**Tip:** Always check the digits in an octal number before converting. Octal numbers only include digits from 0 to 7.

Understand how to convert valid octal numbers like 75, 64, and 54 to decimal. This guide provides a step-by-step conversion process, perfect for students in Grades 6-8 learning about number systems.

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