Take Cube Roots of 6-Digit Numbers Mentally

Step 8 Answers to Step 7 Examples

1) 2,744 (Answer: 14)
2) 704,969 (Answer: 89)
3) 148,877 (Answer: 53)
4) 474,552 (Answer: 78)
5) 24,389 (Answer: 29)
6) 39,304 (Answer: 34)
7) 68,921 (Answer: 41)

Comments

[george1121]

Excellent. reminds me of the story in Richard Feynmans book "Surely you are joing..."--where he beat an Abacus master by "just" doing Mental math--and said something to the effect of that one must one "know numbers". This technique will/should prove to be a motivator to kids. Keep them coming.

[Alexis2445]

That's wonderful! Thank you.