The table below shows the recommended amount of sodium, in milligrams (mg) per day, for all ages according to the Institute of Medicine.

$$ \text{Recommended Daily Intake of Sodium} $$ $$\begin{array} {|c|c|} \hline \text{Age} & \text{Sodium (mg)} \\ \hline 1-3 \text{ years} & 1{,}000 \\ \hline 4-8 \text{ years} & 1{,}200 \\ \hline 9-50 \text{ years} & 1{,}500 \\ \hline 51-70 \text{ years} & 1{,}300 \\ \hline 70 \text{ years and up} & 1{,}300 \\ \hline \end{array} $$

The recommended daily intake of sodium for a toddler (1-3 years old) is what fraction of that recommended for a preteen (9-12 years old)?

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The ratio or fraction of toddler to preteen is:

$$ \text{Recommended Daily Intake of Sodium} $$ $$\begin{array} {|c|c|} \hline \text{Age} & \text{Sodium (mg)} \\ \hline \colorbox{aqua}{$1-3$} \text{ years} & \colorbox{aqua}{$1{,}000$} \\ \hline 4-8 \text{ years} & 1{,}200 \\ \hline \colorbox{yellow}{$9-50$} \text{ years} & \colorbox{yellow}{$1{,}500$} \\ \hline 51-70 \text{ years} & 1{,}300 \\ \hline 70 \text{ years and up} & 1{,}300 \\ \hline \end{array} $$ $$\frac{\text{sodium intake of toddler}}{\text{sodium intake of preteen}}$$ $$=\frac{1{,}000}{1{,}500} $$ $$ = \boxed{\frac{2}{3}} $$