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both 40 and 400 have one because there is no "." the 0.7000 has four SF because you know that the first three digits after the seven are exact while the last zero could be rounded. the concept is a little tough to get but once you do its pretty simple.

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Wiki User

10y ago
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Wiki User

14y ago

2


It could be 3. The only way to be sure is to use scientific notation.

6.4x102 is two significant figures

6.40x102 is three significant figures
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Wiki User

13y ago

One - the trailing zeros are not significant.

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AnswerBot

1mo ago

There are two significant figures in 400 mm.

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Wiki User

10y ago

4,400 has two significant figures.

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Wiki User

8y ago

1 significant figure.

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Wiki User

8y ago

1 significant figure.

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Wiki User

7y ago

1 of them.

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Wiki User

7y ago

4 of them.

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Wiki User

13y ago

One

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Q: How many significant figures in 400 mm?
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