Two - the first three zeros are not significant.
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Ah, isn't that a lovely little number we have here? In 0.0070, we have two significant digits, the 7 and the 0. Remember, significant digits are the numbers that carry meaning and help us understand the precision of a measurement. Just like painting, it's all about paying attention to the details, my friend.
Five. All nonzero digits are significant and zeros in between significant digits are significant.
Three significant digits.
There are five significant digits.
This number has seven significant digits.
All four of the digits given are significant digits.