Identify the place value you want to round to
Look at the digit immediately to the right of that place
If the digit is 0, 1, 2, 3, or 4, keep the target digit the same
If the digit is 5, 6, 7, 8, or 9, increase the target digit by 1
Replace all digits to the right of the target place with zeros for whole numbers
Replace all digits to the right of the target place with nothing for decimals
Check the result to make sure it matches the rounding place