By definition we have to:
The significant figures are the digits of a number that we consider not null.
We have different rules to consider significant figures depending on the number given.
Among some of the rules are:
1) All non-zero digits are significant.
2) For numbers greater than 1, the zeros to the right of the comma are significant.
For this case we have the following number:
56.10 grams
According to the rules, the number zero is counted as a significant figure.
Therefore, the number has four significant figures.
Answer:
56.10 grams = four significant figures.