Question

the diameter of neptune is 30,599 miles.
approximate the diameter of neptune to the nearest thousand miles.
the diameter of neptune is about \boxed{} miles.

Explanation:

Step1: Identify the thousands place

The number is 30,599. The thousands digit is 0, in the place of $10^3$, and the digit to its right, the hundreds place, is 5.

Step2: Apply rounding rule

If the hundreds digit is ≥5, round up the thousands place. The thousands place is 0, so we increase the ten-thousands digit by 1 (from 3 to 3, since 0+1=1, making 30,000 → 31,000) and set all digits to the right to 0.

Answer:

31,000