one quadrillion
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Ten trillion, hundred trillion and then the next named number, which is a quadrillion = 1015. It is not possible to name ALL place values, since there are infinitely many of them.
2,793,149 rounded to the nearest hundred thousand would be 2,800,000. The "hundred-thousands" place is 7, and the next most significant digit is 9. If the next-most-significant digit is 4 or lower, we round down; if it's 5 or greater, we round up. Since the "next-most-significant digit" is 9, we round up from 7 to 8.
1900
To round 5555 to the nearest hundred, look at the tens digit (5 in this case). If the tens digit is 5 or greater, round up to the next hundred. If the tens digit is 4 or less, round down to the previous hundred. In this case, the tens digit is 5, so you would round up to 5600.
10