how many cubes will be needed to build a cube that measures 3 cm along an edge?

Question

cubes that measure 1cm along the edge

Answer 1

OK!!!

Think about the dimensions of that big cube: 3 x 3 x 3 cm

So, to get the length of a side would take 3 of the 1 cm cubes.

To build the square base of the cube would take 3 x 3 =9 little cubes.

And, you need to stack up three of those 1 cm-high squares to finish the cube, so 9 x 3 = 27 little cubes.

Of course, the easy way is to go back to the original dimesions of the big cube: 3 x 3 x 3 cm and realize the the "x" is a multiplication sign.

Answer 2

You don't specify the size of the cubes. Assuming you are using 1 cm cubes, each one represents a "cubic centimeter". A cube that measures 2 cm along an edge will have a volume of 2 cubed, or 2^3. That's 8 - so you would need 8 cubes. Littler cubes - need more of them!

Answer 3

27

Answer 4

there would be 9 on each of 6 surfaces, but some are on 2 sides. the answer should be 3^3=27