99 divided by 0.99
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9 + 9 + 9/9 + (9 x 9) = 100
As a solution to the four fours problem (using the number four no more than four times to come up with the solution, 31 is equal to (4!+4)/4+4!
To make 10 using five nines, you can use the following mathematical expression: (9/9) + (9/9) + (9/9) + (9/9) + (9/9) = 10. This equation involves dividing each nine by itself (which equals 1) and then adding these results together to reach a total of 10.
Well, honey, there are nine nines in a billion. Simple as that. Just count those zeros and you'll see it for yourself. Don't make it harder than it needs to be, darling.
Google "Four Fours" and you will find a number of solutions, presented more comprehensively than we can.