To convert $\frac{4}{15}$ into a decimal, divide 4 by 15:

$\frac{4}{15} = 0.2666\ldots$

This is a repeating decimal, where the digit 6 repeats indefinitely. It can be written as:

$0.\overline{26}$

Let me know if you need further clarification or have any other questions!

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Here are some related questions for further practice:

1. How would you convert $\frac{7}{9}$ into a decimal?
2. What is the decimal form of $\frac{5}{8}$?
3. Can every fraction be written as a terminating decimal?
4. What is the decimal expansion of $\frac{1}{3}$?
5. How do you round repeating decimals to the nearest thousandth?

Tip: To convert a fraction to a decimal, simply divide the numerator by the denominator. If the decimal repeats, you can use a bar notation (overline) to indicate the repeating part.