The volume of a cone can be found using the formula \( V = \frac{1}{3} \pi r^2 h \), where \( r \) is the radius of the base and \( h \) is the height of the cone.
The volume of a cylinder is calculated using the formula \( V = \pi r^2 h \).
Therefore, the last step when calculating the volume of a cone, compared to a cylinder, is to divide by 3.
The correct answer is:
B. Divide by 3.
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