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Labs · Answer 1 · 2018-02-09T17:44:16+0000

3.5
cm would be the first whole number.
So if the number after the whole number (the tenth) is 0-4 the whole number doest change. If it's 5-9 you add one to the whole number.
Since it is a 5 you add one to the 3 making it 4 :)

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