5
543
Five hundred forty.
It is: 8,500
It is: 3543 = 3500 to nearest 100
The digit in the ones position is a 1, so we round down. That means 780 is the answer.
-543 is rational. It is a whole number so it cannot be irrational.
543 rounded to the nearest tens place is 540.
In the decimal system a tenth is 0.1 so there are no tenths involved here and the rounding is no approximation: 543.0
It is: 500
543 is not prime. 543 = 3 * 181
540
100