Those are words but usually when you get to the fourth place you say. "In the fourth place."
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Scientific method is used. First a question is determined. Secondly, information is gathered. Thirdly, an answer to the question is proposed and then tested. Fourthly, a conclusion is made and verified.
If the definition you are using considers 1 to be a proper factor (some teachers say yes, some say no) then add the number 1 to this list. 2,3,6,9
some say it is others dont ussially though one is included as a proper factor
As it is spelled. Use three syllables
Complex numbers are a proper superset of real numbers. That is to say, real numbers are a proper subset of complex numbers.