“Printer’s Errors”

$\displaystyle 2^{5} \times 9^{2} = 2592$

$\displaystyle 2^{5} \times \frac{25}{31} = 25\frac{25}{31}$

$\displaystyle 11^{2} \times 9\frac{1}{3} = 1129\frac{1}{3}$

$\displaystyle 3^{4} \times 425 = 34425$

$\displaystyle 9^{2} - 1^{2} = 92 - 12 = 80$

$\displaystyle \sqrt{2\frac{2}{3}} = 2\sqrt{\frac{2}{3}}$

(Via Robert A. Carman, “Mathematical Misteaks,” Mathematics Teacher 64:2 [February 1971], 109-115.)