Problem 1 Solution
365.25 has 5 significant digits, 1440. has 4 significant digits
Solution Steps for Problem 1The key: Remember the definition of significant digits. When a number is reported, the decimal point matters, but "place holding zeros" do not count.
In the first case, there are clearly 5 significant digits.
In the second case, since the number is followed by a decimal point, that means that the 0 in the units place is significant. Plus you know that there are 24 * 60 minutes exactly in a day by definition, so there are exactly 1440. minutes, and you can be sure that this is a counting number, not a measurement.
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