It is nice to see how geometry could play a vital role in showing students the actual convergence of a sequence of numbers to cube roots, which students only perceive as an algebra problem.

Assume we want to find cube root of a real number N = 285.

Actual cube root to nine decimal places is: [cube root of 285.

To find out the cube root of up to 15-digit perfect cubes or the square root of up to 10-digit perfect squares will take me between 15 and 50 seconds, depending on the number of digits involved," said Mr Thomas.

Mr Thomas said he was also studying how to calculate the cube root of 18-digit numbers mentally.

Curiously these ratios are approximately equal to the cube roots of the number of presentations, i.

For long flashes from large targets, brightness grows as the cube root of luminance.

Students now could also work in the opposite direction - to figure out cube roots.

FIGURE 3 A function-box problem involving cube roots In Out 65 5 126 ?