Here are a few options for a WordPress post tag description for “小數運算” (Decimal Operations) in Traditional Chinese, ranging in detail and SEO friendliness:

**Option 1: Concise & Direct**

> 學習小數的加減乘除等基本運算技巧。 (Learn the basic skills of decimal addition, subtraction, multiplication, and division.)

* **Good for:** A quick, clear explanation.

**Option 2: More Descriptive**

> 熟悉小數的運算規則，包括如何處理小數位數、進位、退位等等。幫助您掌握在數學和日常生活中應用小數的方法。 (Understand the rules of decimal operations, including how to handle decimal places, carrying over, and borrowing. Helps you master how to apply decimals in mathematics and daily life.)

* **Good for:** Providing a bit more detail and mentioning the benefits.

**Option 3: SEO Focused**

> 小數運算教學、小數加法、小數減法、小數乘法、小數除法、小數應用，學習小數算法，提升數學能力。 (Decimal operation teaching, decimal addition, decimal subtraction, decimal multiplication, decimal division, decimal applications. Learn decimal algorithms and improve your math skills)

* **Good for:** Incorporating keywords to help with search engine optimization. This might attract more traffic if users search for these terms.

**Option 4: Targeting a Specific Audience (e.g., Students)**

> 專為中小學生設計的小數運算教學資源。透過練習題和實例，輕鬆掌握小數的計算技巧，奠定數學基礎。 (Decimal operation teaching resources designed specifically for primary and secondary school students. Easily master decimal calculation skills through practice problems and examples to build a strong foundation in mathematics.)

* **Good for:** If your content is aimed at a particular group, tailor the description.

**Key Considerations When Choosing:**

* **Your WordPress Theme:** Some themes may display descriptions differently.
* **Your Content:** Make sure the description accurately reflects the content you’re tagging.
* **SEO:** If you want to improve search visibility, incorporate relevant keywords.
* **Audience:** Consider who you are trying to reach.

**To add the description in WordPress:**

1. Go to **Posts > Tags** in your WordPress dashboard.
2. Locate the tag “小數運算”.
3. Click “Edit” on the tag.
4. Look for a field labeled “Description” or “Tag Description”. (If you don’t see this, you might need to enable it in your screen options at the top right of the page when editing the tag.)
5. Paste your chosen description into the field.
6. Click “Update”.