Integers ending in 0 are an ambiguous case. There are at least two significant figures. However, if the number appeared in a table along with 5602, 5597, then clearly, there are 4 sig figs.
There are 4 significant digits in 5600.
There are four significant digits in the number 1.071.
Three significant digits.
This number has seven significant digits.
All four of the digits given are significant digits.
There are two significant digits in the number 83.
All numbers which are not "zero" are classed as significant digits. Therefore in the number 129 there will be three digits which are classed as significant.
There are 2 significant digits: 5 and 4
Two. All nonzero digits are significant.
All the digits are significant, so there are 5 significant digits.
There are four significant digits in the number 6.741.
The number 42.31 pounds has four significant digits.