To find out how much baking soda Camille should put in each of the 4 glasses, you need to divide the total amount of baking soda (1/4 cup) by the number of glasses (4).
The calculation is as follows:
\[ \text{Amount in each glass} = \frac{1/4 \text{ cup}}{4} = \frac{1/4}{4} \]
To divide by a whole number, you can multiply by the reciprocal:
\[ \frac{1/4}{4} = \frac{1/4} \times \frac{1}{4} = \frac{1 \times 1}{4 \times 4} = \frac{1}{16} \]
So, Camille should put \(\frac{1}{16}\) of a cup of baking soda in each glass.