342,802 to the nearest hundred thousands

1. The number 3 is located in the hundred thousands place.

2. Since the number 4 is located in the ten thousands place, it's telling 3 to stay the same

Stays the Same: 1,2,3,4

Goes Up: 5,6,7,8, etc ...

342,802 ⇒ 300,000

300,00 because when your look to your right 4 is smaller than 5 and that means you turn it into a 0 and the rest follows.