How do you know which place value to round to?

which tool will give you a more precise measurement: a meter stick or a centimeter ruler?

is there a difference between the numbers 51 and 51.0?

how can units be in solving a word problem?

You look to the right when you round

A centimeter ruler is more precise because it is a smaller measurement

Yes, there is a difference between 51 and 51.0 because you now know that there is a 0 behind 51 and it was not rounded to become 51.

Units can be helpful because they can help you picture the world problem or convert any numbers like feet to inches properly.