Answer
$\frac{1}{3}$
Work Step by Step
There are 6 possible outcomes of tossing a single die: 1, 2, 3, 4, 5, 6.
"2 or 3" represent 2 of the 6 possible outcomes, so the probability is 2 out of 6.
$\frac{2}{6}=\frac{2\div 2}{6\div 2}=\frac{1}{3}$