Mental Cube Root
If the cube root of is and the cube root of is , what is the cube root of ?
(Do this one in your head - no writing or calculators allowed!)
The answer is 113.
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Based on the information given, we can conclude the cube root of 1 3 3 1 0 0 0 is 1 1 0 and the cube root of 1 7 2 8 0 0 0 is 1 2 0 . 1 4 4 2 8 9 7 is between these two. Since something ending with a 3 is the only thing which gives something ending in a 7 when cubed, the answer must be 1 1 3 .