Click the following link to start the practice on the CubicPower:
http://www.cubicpower.idv.tw/php/Mobile/EN/VerticalAdditionMobileEN.php
Click the New button to get a new pair of numbers.
Select your answer of each digit column, then click the Check button.
You can correct your answer and then click the Check button again.
Or we can set the Digits to two, then click the New button to get a pair of double digit numbers.
Or three-digit numbers.
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