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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Cube has 6 faces. The surface area of a cube which has a side of 4cm is 6*4^2=6*16 cm^2.

Now,
when the cube is cut into the smaller cubes with side of 1cm we'll get
4*4*4=64 cubes and each will have the surface area equal to
6*1^2=6 cm^2, so total surface are of these 64 cubes will be 6*64
cm^2.

6*64 is 4 times more than 6*16 which corresponds to 300% increase.