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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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Units

American Numbering System #p1

NameValue
tens 10^1 (10)
hundreds 10^2 (100)
thousands 10^3 (1000)
millions 10^6 (1000000)
billions 10^ 9
trillions 10^12
quadrillion 10^15
quintillion 10^18
sextillion 10^21
septillion 10^24
octillion 10^27
nonillion 10^30
decillion 10^33
Created by: JohnW