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30.9
That one has five.
One. 1m = 100cm, and 100 has one significant figure.
It includes all of the digits that have been measured exactly, plus one estimated digit.
The significant figures in a measurement include all digits measured exactly, plus one estimated digit.
30.5
30.9
38 cm
That one has five.
370.0
Exact numbers have an unlimited number of significant figures. For example with numbers like one dozen it is exactly 12.0000000000 with the zeroes repeating forever because numbers such as one dozen are defined as precisely 12 things. Just as one dollar is exactly 100 pennies and so on.
0.0451. 450 has two significant figures, 32.10 and 370.0 each have four.
Congruent figures have exactly the same shape; you could superimpose one on the other and see only one figure. Similar figures have some points of similarity but do not have to be exactly the same.
There is only one number and it has 16 significant figures!
One. 1m = 100cm, and 100 has one significant figure.
a ray and a line
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