Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to, in this case, the second from the left. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out. If your target digit is 9, it will become a zero and increase the digit to the left of it by one.
What would be 159.45 if you round it to the greatest nonzero place
0.5
0.05
200
To the nearest ten, 70
What would be 159.45 if you round it to the greatest nonzero place
0.5
0.05
200
To the nearest ten, 70
That rounds to 40.
It is 72.
80
The greatest nonzero place is the number closest to the left (or the greatest number) that is not zero. So in this example, that would be the 8. So you would round the 8 up to a 9 (since 6 is greater than 4). So your answer would be 0.9
0.6
It is 1.
4841