I spent weeks and weeks doing the same thing over and over - multiply these 2 digit numbers together. Multiply these three digit numbers together. next week? 4

I spent weeks and weeks doing the same thing over and over - multiply these 2 digit numbers together. Multiply these three digit numbers together. next week? 4 digit numbers!!! Some people needed to do that, some didn't. What is wrong with work until you get it, instead of having to do page after page of rote work when you have clearly demonstrated that you understand the material?