[whatshisface]

"Just calculate harder" is reasonable advice for a lot of people. If you think of your skill level as a multiplier on your effort, more effort will help for anyone with a skill level above zero. If you're worse than normal at math a lot of people would tell you that you needed to spend even more time studying.

Spending more time in a learning environment is a very reasonable thing to advise a slow learner do, math or otherwise.