Question

3,857 rounded to the nearest thousand

Answer 1

3,857: 

1. 3 is located in the thousands place

2. Since 8 is bigger than 3, it's telling it to go up a number (turning 3 into a 4)

Stays the Same: 1,2,3,4
Goes Up: 5,6,7,8, etc.

So 3,857 is now rounded into 4,000

Answer 2

I think it's 4,000. Hope it helps.