Rounding means making a number simpler but keeping its value close to what it was. The result is less accurate, less exact, but easier to use.
Example: 73 rounded to the nearest ten is 70, because 73 is closer to 70 than to 80.
What are the rules for rounding off numbers?
Here's the general rule for rounding:
If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up by 1.
Example: 57 rounded to the nearest ten is 60.
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down by 1.
Example: 54 rounded to the nearest ten is 50.