2020. Figured out number pad layout!
I feel like a poephol in Afrikaans language. I searched forever and eventually found the answer hidden here. Thank to it this is what I did thanks to the person that posted it. To change the number pad to a calculation type layout I did the following. I went to SwiftKey settings, click on number pad and layout and then you choose, (right number pad or left number pad and BINGO! It worked for me! I hope it works for you. SwiftKey developers! Please can you make this number pad setting easier to find? Just call it, number pad layout, etc or something like that.