0
If you are looking at this from a maths perspective, the 'significant figures' are the number of digits counting from the first non-zero digit, so the number of significant figures in 10.0 is three.
You may be asked a question, and told to give the answer 'to three significant figures'. This would mean the answer would look something like '12.2' or '0.0254'.
This is in contrast to decimal places, which refer to the number of digits after the decimal point. For example, the number 10.0 is quoted to one decimal place.
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How many significant figures does 100 5.4 does this have?
There are 5 significant figures in this number.
How many significant figures in 100.?
That depends on whether the dot before the question mark is a period or a decimal point. 100 has one significant figure. 100. has three significant figures.
How many significant figures are there in 100?
1 of them.
How many significant fignificant figures in 100?
There is just one significant figure.
How many significant figures are in 100 plus 150?
100 has one, 150 has 2, 250 has 2.
