3 sig figs.
There are four significant digits in the number 6.741.
4
The number 456 has three significant digits. All non-zero digits are considered significant, so each of the digits 4, 5, and 6 counts towards the total.
It has two significant digits.
It has 3 significant digits.
3 significant digits.
Five. All nonzero digits are significant and zeros in between significant digits are significant.
Count the significant digits in each of the factors, and take the smallest of them.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
50.4 has 3 significant digits.