I was working with my son on some number sense and quickly I realized a pattern that was playing in his mind - "But I don't know that."
And, we focussed our efforts on writing the problem on the paper and writing everything we know that might help us solve the problem. And, soon he was starting to leverage what he knew to get to what he did not know.
Too often in careers and life, we get stuck in this cycle of don't knows. That is the point. We are not supposed to know everything every time but should be able to get the knowledge by leverage what we know already.
Get to what you don't know by leveraging what you know already. You will be surprised at the results.