Multiplication Table 

 Quick instructions
      To perform the multiplication 3 times 5, click on the button "3" in the first column and on the button "5" in the first row of the table. Next, click the equals sign button "=" in the upper right corner of the table. The result appears as a number in both the last column and last row of the table. At the same time, the first five white squares in the first three rows turn yellow creating three rows by five columns of fifteen yellow squares.
      Consecutive numbers in the last column show the total number of yellow squares in one, two and three rows of the particular yellow rectangles related to the multiplication of three times five. The consecutive numbers in the last row show the total numbers of yellow squares in one, two, three, four and five columns of this yellow square.
      This process visualizes the structure of multiplication and its relation to the operation of addition showing that 3 x 5 equals 5 + 5 + 5 or 3 + 3 + 3 + 3 + 3. 
      Using the button "C" we can change the color of the squares. The actual color is shown in the lower right corner of the table.