If cell A1 = 10 and B1 = 20, what will `=A1+B1` return?
30
In spreadsheet applications such as Microsoft Excel, an entry that begins with an equals sign (=) tells the program to calculate a value rather than treat the entry as plain text. The + symbol placed between two cell references is the standard arithmetic addition operator, so =A1+B1 instructs the spreadsheet to fetch the numeric values currently stored in cells A1 and B1 and add them together.
Given A1 = 10 and B1 = 20:
=A1+B1 = 10 + 20 = 30
This result updates automatically whenever either A1 or B1 changes, which is the core advantage of using cell references in formulas rather than typing fixed numbers directly.
The other results listed correspond to different operations, not addition: a result of 1020 would occur only if the two values were joined together as text using the concatenation operator (=A1&B1), which strings "10" and "20" together character by character instead of adding them numerically; a result of 200 would come from multiplying the two cells (=A1*B1); and an "Error" output would appear only if the formula contained invalid syntax, referenced a non-existent cell, or one of the operands was non-numeric text incompatible with arithmetic — none of which applies here, since both A1 and B1 hold valid numbers and the formula syntax is correct.
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