engineering foundations 2 calculations and converstions question.

Question

How do I round off the following numbers to three significant figures? Or can you give me an example of how to round off number

1. 4.65735 m
2. 55.578 s
3. 4555N
4. 2768 kg

Answer 1

take the first.
The third digit is the 5, but rounding off with a seven to the right becomes 4.66