Well, isn't that a happy little question! When we round 2340 to the nearest 1000, we look at the hundreds place. Since the digit in the hundreds place is 3, which is less than 5, we keep the thousands place as it is and change the hundreds and tens places to zero. So, 2340 rounded to the nearest 1000 is 2000.
2340
It is 2350 when rounded to the nearest ten
2340
1000
1000
1000
1000
176 rounded to the nearest 1000 is 0
1000
1000
0
1000