If we rounded 3 to the nearest tens, it would be 0.
Number 1 Rule:
If the number is above 5, round up.
5, 6, 7, 8, and 9
If the number is 4 and below, round down.
4, 3, 2, and 1
Since the number is 3, we have to round down to the nearest ten, which is 0.
90
40
400
10
200
90
40
400
10
200
10
500 000
600
1000
94000
8300
56000