🔢 数位计算器（每一位的数位名称、位值、展开式，含小数）Place Value Calculator (Place Names, Digit Values, Expanded Form, Decimals)
列出一个数每一位数字所在的数位（个、十、百、千、万…以及十分位、百分位…），每位的位值和展开式；支持最多 30 位整数和 15 位小数，可带负号。本地处理。Shows the place of every digit (ones, tens, hundreds, thousands… and tenths, hundredths…), the value of each digit and the expanded form, for up to 30 integer digits and 15 decimal places, with an optional minus sign. Processed locally.
使用说明与常见问题How-to & FAQ
「数位计算器（每一位的数位名称、位值、展开式，含小数）」是什么？What is the Place Value Calculator (Place Names, Digit Values, Expanded Form, Decimals) tool?
列出一个数每一位数字所在的数位（个、十、百、千、万…以及十分位、百分位…），每位的位值和展开式；支持最多 30 位整数和 15 位小数，可带负号。本地处理。Shows the place of every digit (ones, tens, hundreds, thousands… and tenths, hundredths…), the value of each digit and the expanded form, for up to 30 integer digits and 15 decimal places, with an optional minus sign. Processed locally.
如何使用「数位计算器（每一位的数位名称、位值、展开式，含小数）」？How do I use the Place Value Calculator (Place Names, Digit Values, Expanded Form, Decimals) tool?
在「数位计算器（每一位的数位名称、位值、展开式，含小数）」中，填写「数」等参数，结果会随输入实时计算并显示在下方。In the Place Value Calculator (Place Names, Digit Values, Expanded Form, Decimals): Fill in "Number"; results are recalculated instantly as you type.
数位和位值有什么区别？What is the difference between place and place value?
数位是数字所在的位置（如百位）；位值是这个数字实际代表的大小。在 3,456 中，4 在百位，它的位值是 400。The place is the position of a digit (e.g. the hundreds place); the place value is what the digit is worth there. In 3,456 the 4 is in the hundreds place and its value is 400.
中文的数位怎么分？How are Chinese places grouped?
中文按四位一级：个、十、百、千，然后是万、十万、百万、千万，再到亿。英文按三位一组（thousand、million、billion）。Chinese groups places in fours: ones, tens, hundreds, thousands, then wan (ten thousand) up to qian-wan, then yi (hundred million). English groups in threes (thousand, million, billion).
能举个计算实例吗？Can you show a worked example?
例如在「数位计算器（每一位的数位名称、位值、展开式，含小数）」中填 数 = 3456，结果区显示：数：3,456；各位数字的数位：3：千位；4：百位；5：十位；6：个位；展开式：3,000 + 400 + 50 + 6For example, entering Number = 3456 in the Place Value Calculator (Place Names, Digit Values, Expanded Form, Decimals) gives: Number: 3,456; Place of each digit: 3: thousands; 4: hundreds; 5: tens; 6: ones; Expanded form: 3,000 + 400 + 50 + 6
有哪些选项可以调整？What options can I adjust?
「数位计算器（每一位的数位名称、位值、展开式，含小数）」的设置：「数」默认 3,456.27。每次生成结果都按当前设置处理。Settings in the Place Value Calculator (Place Names, Digit Values, Expanded Form, Decimals) — "Number" default 3,456.27. The result always uses the current settings.
计算精度如何？How precise are the results?
「数位计算器（每一位的数位名称、位值、展开式，含小数）」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Place Value Calculator (Place Names, Digit Values, Expanded Form, Decimals) uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「数位计算器（每一位的数位名称、位值、展开式，含小数）」免费吗？需要注册吗？Is the Place Value Calculator (Place Names, Digit Values, Expanded Form, Decimals) free? Do I need an account?
「数位计算器（每一位的数位名称、位值、展开式，含小数）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Place Value Calculator (Place Names, Digit Values, Expanded Form, Decimals) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.