價格：免費
檔案大小：1.6 MB
版本需求：系統需求：iOS 13.4 或以後版本。相容裝置：iPhone、iPad、iPod touch。
支援語言：英語
The major functionality of this app is to provide a software abacus on your iPhone so that you can play with that without carrying a physical abacus.
The app also introduces how to correctly use thumb and index finger to move beads and some important concepts like ten's and five's complement to support arithmetic operation.
This app also gives you some basic addition samples to help you how to operate your abacus to reach the right answer for related operations.
