To solve the expression $4 + 6 \div 9 - 4$, we need to follow the order of operations (PEMDAS/BODMAS), which dictates the sequence: Parentheses/Brackets, Exponents/Orders, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right).

Step-by-step Solution:

1. Division first: $6 \div 9 = \frac{6}{9} = \frac{2}{3} \approx 0.67$

2. Substitute back into the expression: $4 + 0.67 - 4$

3. Addition and Subtraction from left to right: $4 + 0.67 = 4.67$ $4.67 - 4 = 0.67$

Final Answer:

$\boxed{0.67}$

Would you like more details on this calculation or have any questions?

Here are 5 related questions for further practice:

1. What is the value of $8 + 5 \div 10 - 2$?
2. How would you solve $10 - 4 + 8 \div 2$?
3. Calculate $15 \div 3 + 2 \times 5 - 7$.
4. What is $7 + 6 \times 2 - 3$?
5. If you have $12 \div 6 + 5 \times 2$, what is the result?

Tip: Always remember to perform multiplication and division before addition and subtraction in mathematical expressions.