使用说明
点击算珠可以移动它们。上方每颗算珠（上珠）代表5，下方每颗算珠（下珠）代表1。
每列上方有2颗上珠，下方有5颗下珠，珠子靠近横梁时表示计数，远离横梁时不计数。
上方第二颗珠子必须在第一颗已靠近横梁时才能移动。每列最多可表示15（5×2+1×5=15）。
算盘从右到左依次表示个位、十位、百位等。点击"使用说明"按钮获取更多详情。
Instructions
Click on beads to move them. Each upper bead represents 5, each lower bead represents 1.
Each column has 2 upper beads and 5 lower beads. Beads count when moved toward the beam, and don't count when away from it.
The second upper bead can only be moved after the first one is already at the beam. Each column can represent up to 15 (5×2+1×5=15).
The abacus reads from right to left: ones, tens, hundreds, etc. Click the "Instructions" button for more details.
常见问题
什么是二五珠算盘？
二五珠算盘是中国传统算盘的一种，每列有上方2颗珠子（每颗代表5）和下方5颗珠子（每颗代表1）。它是中国古代重要的计算工具，至今仍在使用。
算盘如何进行计算？
算盘通过拨动珠子来计算。珠子靠近横梁时计数，远离横梁时不计数。上珠每颗代表5，下珠每颗代表1。每列从右到左依次表示个位、十位、百位等。
算盘有什么历史意义？
算盘是中国古代四大发明之外的重要发明，有超过2000年的历史。它不仅是计算工具，也是中国传统文化的重要组成部分，对数学教育和思维发展有独特价值。
Frequently Asked Questions
What is a 2-5 abacus?
A 2-5 abacus is a traditional Chinese abacus with 2 beads in the upper deck (each representing 5) and 5 beads in the lower deck (each representing 1). It has been an important calculation tool in ancient China and is still in use today.
How do calculations work on an abacus?
Calculations are performed by moving beads toward or away from the beam. Beads count when moved toward the beam, and don't count when away from it. Each upper bead represents 5, each lower bead represents 1. Columns represent place values from right to left: ones, tens, hundreds, etc.
What is the historical significance of the abacus?
The abacus is an important invention beyond China's Four Great Inventions, with over 2000 years of history. It's not just a calculation tool but also an essential part of Chinese traditional culture, offering unique value for mathematics education and cognitive development.
