The F4 key can be used as you are typing in the cell reference in order to change it to a different reference type.
As you are typing in the actual cell reference, press the F4 key and it will change it between the 4 available settings. So if your cell is C10, when you press F4 immediately after typing it, it will become: $C$10 then C$10 then $C10 and then back to C10. When you have it the way you want it, continue typing your formula or just press return if the formula is finished.
If you want to copy a formula from one cell to another (or fill down) without Excel changing the cell references automatically, you'll need to write the cell references with dollar signs included for absolute referencing. Eg: the reference '$D3' locks the reference to column 'D' but allows the row to change when the cell is copied. Eg: the reference 'D$3' locks the reference to row '3' but allows the column to change when the cell is copied. Eg: the reference '$D$3' locks the reference to column 'D' and row '3', so the cell reference cannot change at all when the cell is copied. While you are typing in a cell reference, pressing the 'F4' key will cycle through the combinations for you, so you don't need to type the dollar signs yourself.
F2 Key, the 2nd function key on the top row of the keyboard
If you mean have it so that if the formula is copied, that the cell reference won't change, then you use an absolute reference. To do that put a dollar before the column reference and one before the row reference. As an example A3 would be $A$3 when locked. A quick way as you type the cell reference is to press the F4 key to change the reference type.
If you enter the cell address as a relative cell, then yes. You can make a cell reference mixed or absolute, which will change how it behaves when the formula is copied. $A$1 is an Absolute reference. It won't change when the formula is copied. $A1 and A$1 are both Mixed references. When the formula is copied, the part of the cell reference immediately after the $ will not change. The A will never change in $A1 but the 1 can change. The A can change in A$1 but the 1 can't. A1 is a Relative reference. When the formula is copied both the row and column reference can change. When you are typing in a formula, at the point you get to the cell reference, press the F4 key and it will change the style of the cell reference. If you keep pressing it, it will cycle through the different forms of referencing for that cell.
The F4 key, when you are typing in the reference to the cell.
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You can type in the dollars before the column and row in the cell reference, so A3 could become $A$3 in the formula. While you are typing a cell reference in a formula, pressing the F4 key will cycle through the relative, absolute and mixed cell references, so that is another way of doing it.
In Excel you can use the UPPER function. You can put a cell reference into it or even specific text. =UPPER("change this") This will result in CHANGE THIS. =UPPER(A3) This will display the content of cell A3 in uppercase in the cell that the formula has been typed into.
The key function of a cell membrane is to regulate the passage of molecules in and out of the cell. This selective permeability helps maintain the internal environment of the cell and allows it to communicate with its surroundings.
They will be recalculated automatically if automatic calculation is on, which it normally is, and an updated result will be shown. If manual calculation is on then no change will happen until the F9 key is pressed.