If cell A1 = 10 and B1 = 20, what will `=A1+B1` return?
30
In a spreadsheet such as Microsoft Excel, a cell reference like A1 stands for the value stored in that cell. When a formula begins with the = sign, Excel treats what follows as a calculation to evaluate rather than as literal text.
The + symbol is the arithmetic addition operator, so =A1+B1 instructs Excel to fetch the numeric contents of A1 and B1 and add them:
- A1 = 10
- B1 = 20
- =A1+B1 → 10 + 20 = 30
Hence the formula returns 30.
The distractors correspond to different operators or mistakes:
- 1020 is what you would get from text joining, using the concatenation operator (=A1&B1), which strings the characters "10" and "20" together instead of adding them.
- 200 is the product of the two values, produced by the multiplication operator (=A1*B1), not by addition.
- Error would appear only if the formula were malformed or referred to invalid data (for example a #VALUE! error when adding text). Here both cells hold valid numbers, so no error occurs.
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