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About 4-digit Addition & Subtraction
4-digit Addition Subtraction4-digit and 3-digit addition4-digit minus 3-digit
4-digit and 3-digit addition Drill
4-digit minus 3-digit Drill
4-digit Addition Drill
4-digit minus 4-digit Drill
Three 3-digit Addition Drill
Subtracting from 4-digit numbers Drill
What's new in the latest 1.2
Last updated on 2017-05-31
增加：1. "先看數字輸入技巧" 更詳細解說輸入技巧，以增加數字輸入的正確性。
2. 測驗成績的寄送，寄件者改由系統發送信件。
2. 測驗成績的寄送，寄件者改由系統發送信件。
Gameplay and Screenshots
- 4-digit Addition & Subtraction for Android official Trailer
Old Versions of 4-digit Addition & Subtraction
4-digit Addition & Subtraction 1.2
1.2 MBMay 31, 2017
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