把 84 596 四舍五入到千位。

1. Identify the digit in the thousands place and the digit to its right

In $84\ 596$, the digit in the thousands place is $4$. The digit to its right (hundreds place) is $5$.

2. Apply rounding rules

Since the digit in the hundreds place is $5$, we round up by adding $1$ to the thousands digit. The thousands digit becomes $4 + 1 = 5$. The digits to the right become $0$.
$84\ 596 \approx 85\ 000$