The four operations are addition, subtraction, multiplication, and division.

Representing and solving word problems involves choosing the correct operation(s).

To find how much greater the amount of cookies is than the amount of cupcakes, subtract the fraction of the items which are cupcakes from the fraction of the items which are cookies.

$\frac{5}{8}$ - $\frac{1}{4}$ |
= | $\frac{5}{8}$ - $\frac{2}{8}$ |

| = | $\frac{3}{8}$ |

So, $\frac{3}{8}$ more of the items at the bake sale are cookies than cupcakes.

To find how long Cheryl walked her dog, multiply $2\frac{1}{3}$ by $\frac{1}{4}$ of an hour.

$2\frac{1}{3}$ × $\frac{1}{4}$ hour | = | $\frac{7}{3}$ × $\frac{1}{4}$ hour |

| = | $\frac{7}{12}$ hour |

So, Cheryl walked her dog for $\frac{7}{12}$ of an hour.