Map number block keys to number row

Hey, does anybody know how to map the number keys from a number block onto the number key row of the keyboard? I’m trying to play some really old game (emulated in DOSBox) which seems to depend on the usage of the number block for some reason. Point is, I don’t have one on my laptop, only the usual number row. But the game is from the 90s, so it seems to not been build with this being a realistic circumstance. Is there a way to somehow use the number row and still have the game think the number block is being used?