Unlike square root, note that a negative number cannot be the cube root of a number.
Eg. : The product of 4 with 4 three times is equal to 64. That is, 4 × 4 × 4 = 64.
Also note that (-4) ×^ (-4) × (-4) = -64. Hence the cube root of 64 is 4 and the cube
root of -64 is -4.
The idea of cube root may be explained to the child orally, providing additional input
in the form of Braille text material.