What does “put two and two together” mean?

to guess the truth from what you see, hear, etc.

How is “put two and two together” used?

In Beautiful Thing (1996), one line is: “Because sometimes, Jamie, I can put two and two together and make bloody four.”

The clip at the top of this page is from Beautiful Thing (1996).

Because sometimes, Jamie, I can put two and two together and make bloody four.

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