Google’s proprietary keyboard comes default on many devices, and for most of us, it generally stays active. One odd behavior of the keyboard that often confuses users is how the number pad is ...

When the Num Lock function is enabled, these keys act as a number pad. To get the keys working as part of the normal keyboard again, you'll need to turn off the Num Lock function.

You say your keyboard's number pad is non-functional? Here's the cure.