A letter used in place of a numeral is called a variable.
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in the number 64374 what numeral is in the ten's place
It means to move the decimal point to the left until only one numeral remains to the right side of the decimal point, and to increase that one numeral by adding one if the next numeral to the right of it was 5, 6, 7, 8 or 9 or to decrease that one numeral subtracting one if the next numeral to the right of it was 0, 1, 2, 3 or 4.
Im guessing, by the question, its a Roman Numeral. But the wording is bad. Will a supervisor edit that?