Numeric pad will not function as a numeric pad

[LearninToFly]

Since installing Linux lite the numeric pad has acted only as a mouse pointer. I have a HP keyboard on my Dell 4550, but the HP keyboard model number: KB-0630 is not listed the Settings/Keyboard/Keyboard model. It makes no difference if the Number Lock is on or off the number pad will not type a number, it will only use the arrow keys to move the cursor. Please help me to find the settings to change my numeric pad into a true numeric pad.