A dollar sign before the number means the row won't change; if you enter "=B$1+C1" into cell D1 and then copy it to cell D2, it will change to "=B$1+C2". And a dollar sign before bot...A dollar sign before the number means the row won't change; if you enter "=B$1+C1" into cell D1 and then copy it to cell D2, it will change to "=B$1+C2". And a dollar sign before both the column and the row means that nothing will change; if you enter "=$B$1+C1" into cell D2 and then copy it into cell E2, it will change to "=$B$1+D2". So if you had 100 numbers in column B, you could enter "=B1−AVERAGE(B$1:B$100)" in cell C1, copy i…