A cake recipe requires $\dfrac{5}{8}$ cup of flour. Mary and Haloa decide to make the cake together. Mary has $\dfrac{1}{3}$ cup of flour and Haloa has $\dfrac{1}{4}$ cup of flour. How many more cups of flour do they need to make the cake?

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We can manually or use the calculator to add the amount Mary and Haloa have:

$$\frac{1}{3} + \frac{1}{4}$$ $$\frac{4}{12} + \frac{3}{12} = \frac{7}{12}$$

The amount they need:

$$\frac{5}{8} - \frac{7}{12}$$ $$\frac{15}{24} - \frac{14}{24}$$ $$= \boxed{\frac{1}{24}}$$