Well, isn't that a happy little question! When you have nine groups of ten, you have a total of 90. Each group of ten adds up to 10, and when you have nine of them, you simply multiply 9 by 10 to get your answer. Just imagine those groups of ten as little trees in a beautiful forest of numbers!
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This is the same as 10 X 9 which is 90
It is: 10+(-1) = 9
The number 1068910 would be spelled out "one million, sixty-eight thousand, nine hundred ten".(*optionally an and between hundred and ten)
one third of nine is three, therefore:-ten thirds of nine = three times ten which is thirty.
Seven and ten elevenths.
Four hundred eighty-six and four thousand, nine hundred forty-nine ten-thousandths.