How many significant digits is 10.00?

Answer 1

Four.

All non zero numbers are always significant.

Zeroes that are between non zero numbers are always significant.

Zeroes that are to the right of a non zero number and that contain a decimal point are significant.

Answer 2

1

a significant figure is any number that isn't 0

...

That is not correct.

There are four significant figures in the number. Trailing zeros after the dp are significant as they indicate the precision of the number.

There are problems with using the concept of significant figures. It is not always possible to determine whether a zero is significant or not as the Wikipedia article explains.

Furthermore, the number of significant figures in a number can change on successive cases even if the number does not change by very much - for example

99 (2 sig fig)

100 (1 sig fig)

101 (3 sig fig)

Answer 3

Four significant figures.

Answer 4

10.00 has 4 sig figs.

Answer 5

4

Answer 6

three

Answer 7

4

Answer 8

4

Answer 9

seven

Answer 10

3