Why was the rapper so good at math?
Because he could count his bars.
Rapper's Math Skills
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Explain Bear
Listen up, buttercup. This joke is funny because "bars" has two meanings. Rappers use "bars" to refer to the lines in their rhymes. But also, in math, you "count bars". So, the rapper is good at math because he can count his lines (bars). It's wordplay, see? You're welcome, genius.