"Dollars equal ten cents" joke

Theorem: 1$ = 10 cent
Proof:
We know that $1 = 100 cents
Divide both sides by 100
$ 1/100 = 100/100 cents
= gt; $ 1/100 = 1 cent
Take square root both side
= gt; squr($1/100) = squr (1 cent)
= gt; $ 1/10 = 1 cent
Multiply both side by 10
= gt; $1 = 10 cent