Three - all non-zero numbers are significant.
Zero is considered a significant digit when it is to the left or the right of the decimal point. It is also a significant digit when it follows a non-zero digit or when it is between two digits.
The most significant thing about the temperature of absolute zero is that is marks the point where molecular motion stops. It is equal to −459.67 degrees Fahrenheit.
The number 7380 has three significant figures. The zero is not significant because it is not followed by a decimal point.
Non-zero digits are always significant, so the number 12 has two significant figures.
It has no significant zero because It is a leading zero
Any non-zero digit, if it appears in the decimal representation of a number, is significant. A zero is significant if it is not a leading zero.
Only one of them is significant. The leading zero (zero to the left) is not significant. The trailing zero (rightmost) is significant. To recap, only the zero following the seven is significant. See the related links for a really good article on significant digits.
0.7 has one significant figure. Any non-zero digit is significant (165 has three significant figures). Any zero between non-zero digits is significant (304 has three significant figures). Any zero to the right of a non-zero digit in a number which includes a decimal point is significant (10,000 has one significant figure, .0001 has one significant figure, but 100.0 has four significant figures, as does 0.001000). In this case, only the 7 is significant.
four The one and five are automatically significant because they are non-zero digits. The first zero is significant because it is between two other significant figures, and the trailing zero is significant because it comes after a decimal point.
Two significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
Four significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
Six significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
Five significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
Four significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
Two significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
Eight significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.