*natural numbers.*

**n**- Drag the slider “NumberCubes” to create up to seven cubes.

Think of each cube as a collection of

*x*

**n n***square layers of unit cubes. To find a formula for the sum of the cubes of the first natural numbers we will rearrange the square layers.*

**n**- Drag the slider “Rearrange” or press the “animate” button.

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Irina Boyadzhiev's GeoGebra Applets