How do you round 65.145 meters to 4 significant figures?
Step 1. Underline the first four numbers (4 significant figures)
Step 2. Round up or down based on the 5th value
Rules for rounding:
- If the next number is 5 or more, round up
- If the next number is 4 or less, round down
- Non significant figures all become zero
- If the final, non-significant numbers are to the right of the decimal, then delete these final numbers
Step 3. Round up and turn the last digit(s) to zero. If the final, non-significant numbers are to the right of the decimal, then delete them all together.