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To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

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Stack #2636587

QuestionAnswer
10mm 1cm
100cm 1m
1000m 1km
2km 2000m
2m 200cm
2cm 20mm
35000m 35km
Created by: shorn862