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Mental Cube Root (Posted on 2004-03-10) Difficulty: 2 of 5
If the cube root of 1331 is 11 and the cube root of 1728 is 12, what is the cube root of 1442897?

(Do this one in your head - no writing or calculators allowed!)

See The Solution Submitted by Gamer    
Rating: 2.6667 (9 votes)

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Solution My guess | Comment 1 of 6

Since 1442897 is just over 1,000,000, the cube root must be slightly over 100. If it was 110, its cube would be 1331000, still too small by a little.  Since we want the last digit cubed to end in 7, the last number must be 3, making the answer



  Posted by Bryan on 2004-03-10 14:51:20
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