Instructions:
Click "Start" to do the drill;
Key Pad:
- Click "Hide/Show Carry" to hide or show carry as a red dot;
- Click "Show/Hide Hint" to show of hide hint;
- Click number keys to enter your answer;
- Click "DEL" to erase the most recenly entered digit;
- Click "AC" to clear all digits;
- Click "=" to check your answer.
Key board:
- Type the number keys to enter your answer;
- Press "Delete" to erase the most recenly entered digit;
- Press "Backspace" to clear all digits;
- Press the Space bar, "=" or "Enter" to check your answer.
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