Just look at the hundreds column, if the number is 5 or higher, then the numbers go up. If its 4 or lower, then down they go.
Tad da.
300
800
800 is the answer..
200
200
It is 1000000.
900
When rounding to the nearest hundred, the answer is: zero
It is 4,100,000
Nearest hundredth, 2.85 Nearest hundred, zero
It is then 800 when rounded to the nearest hundred
To the nearest hundred... 7800 - To the nearest hundredth... 7856.43