 So, let's say you want to multiply two numbers in Excel 2 times 3. One way you can do that, you can start by typing equals, and then just type 2 star 3, hit enter, and Excel will give you the answer, however there is a better way to do this. That is, instead of writing 2, I click on the cell that contains my number 2, and then on the cell that contains my number 3. And you see that Excel creates a formula. Now, why is this better? Because now I can go change the numbers, for example, two to three, four, and Excel will automatically update the calculation. Another thing I can do, I can go in the corner and I can drag this formula down to other cells if I have to do similar calculation. For example, here, the three times five, the five times two. I'll be done very quickly if I program it with references to cells.