**how to calculate fixed one cell to many cells by using formula?**

How to calculate the value of a single cell from the cell value of the different columns by formula?

for exp.: i want multiply cell "A1" to any column's cell value, but repeat above cell A1

=B1*A1

=B3*A1

=B5*A1

=B7*A1

what formula this condition?

Shall I then copy paste the formula in the cell of the fold.

pl z guide me.