If I do, don't tell me what the mistake is; just say, "you're close," or something like that, and I'll try and figure out the answer -- which could be pretty entertaining in itself.
如果算错了，不要告诉我哪里错了； 只要说，‘接近了，’或者类似的，然后我会再试着算出正确的答案 -- 这样会更有趣点。