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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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High Numbers

17,050 seventeen thousand and fifty
700,000 seven hundred thousand
750,005,700 seven hundred fifty million five thousand seven hundred
705,070,500 seven hundred and five million, seventy thousand five hundred
770,005 seven hundred and seventy thousand and five
70,557,500 seventy million, five hundred and fifty-seven thousand, five hundred
7,005,070 seven million,five thousand and seventy
17, 700, 500 seventeen million, seven hundred thousand and five hundred
7, 015 seven thousand and fifteen
50, 017, 700 fifty million, seventeen thousand, seven hundred
517, 000,715 five hundred and seventeen million, seven hundred and fifteen
57,050,715 fifty-seven million, fifty thousand, seven hundred and fifteen
715,500,007 seven hundred and fifteen million, five hundred thousand and seven
50,070 fifty thousand and seventy
150,070,017 one hundred and fifty million, seventy thousand and seventeen
Created by: Maru Rodriguez