Forms :: Make Calculation For A Specific Row In Access Form

I'm pretty new to Access. I was wondering if it's possible to make a calculation for a specific row in an Access form.

I placed an example in the attachment (I made it quick in paint, because the actual Access form is in my language "Dutch" ):

Value1 and Value2 come from a database, so the amount of rows can change. When I click on "Calculate" on the first row, it should calculate 12 * 13 and show the solution only on row 1. If I click on "Calculate" on the second row, it should show the solution of 10 * 20 only on row 2.

I tried to solve this by using the following VBA code:

Private Sub Calculate_Click()
Solution.Value = Value1.Value * Value2.Value
End Sub

But if I click on the first "Calculate" button, it will fill all solutions with the first calculation (12 * 13).. The same happens when I click on "Calculate" on the second, third row etc.