Answer
Jonas will receive 3 ounces at his next treatment.
Work Step by Step
A full dose is 4$\frac{1}{2}$ ounces, which equals $\frac{9}{2}$. For his next treatment, Jonas will receive $\frac{2}{3}$ of the full dose. So, he will receive $\frac{2}{3}$ of $\frac{9}{2}$. So, we multiply $\frac{2}{3}$ by $\frac{9}{2}$ to find out how much he will receive.
$\frac{2}{3}$ $\times$ $\frac{9}{2}$ = $\frac{2\ \times\ 9}{3\ \times\ 2}$ =
Cancel the common factors between the numerator and the denominator to obtain:
$\frac{2\ \times\ 9}{3\ \times\ 2}$ = $\frac{9}{3}$ = 3 ounces
