standard_description: Understand a rational number as a point on the number line. Extend number line diagrams and coordinate axes familiar from previous grades to represent points on the line and in the plane with negative number coordinates.
problem_activity: Task
A rectangular tank is $24\text{ cm}$ wide, and $30\text{ cm}$ long.  It contains a stone and is filled with water to a height of $8\text{ cm}$.  When Amy pulls the stone out of the tank, the height of the water drops to $6\text{ cm}$.  Find the volume of the stone.
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aligns: no