Since Windows 95, till now, all versions of Windows has an accessibility feature called MouseKeys. This little known utility can be used to control the mouse quite easily with the keyboard.
How to control mouse with the keyboard
Press Alt + Left Shift + Num Lock at the same time. This will show you an message as shown below. Press Spacebar or Enter on your keyboard to select Yes.
Now you can use the Numpad keys on your keyboard to the mouse ! (You can also access Ease of Controls menu by pressing Windows Key + U)
You might be confused on which keys control the clicks on the mouse. This image should make it clear.
For more interesting features of Windows, check 4 Programs you didn’t know existed on your computer.