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=SUM(A1:A15) If this SUM formula is put into cell A16, then the numbers in the cells above (A1 to A15) will be shown in cell A16 as a total.
They are called cell content. They could be labels or formulas.
While they may have been called magic squares, there is absolutely nothing magical about them. The arrangement of numbers in magic squares is all very rational.
Not at all. The class of "natural" numbers are all positive, but the classes of "real" numbers and "rational" numbers include negative numbers.
All the positive real numbers are natural numbers.