Hi Kizudo,
Could you please give examples of the type of problems that the children were solving.
http://www.acceleratedlearningmethods.com/jones-geniuses-math-kits.html"Dr. Jones math curriculum is the most advanced, exciting and easy to implement program I have ever found. The kids excelled quickly and came to enjoy a subject they had only tolerated before. My 3-year-old learned the basics of reading and math.
My 17-year-old is doing cube roots in her head. What more can you ask of in a course of study?"
- Cindy Camp, Garland, Texas
Cube root trick- Any two-digit number cubed.
You only need to learn the cubes from 1 to 10 to calculate cube roots
1 cubed = 1 NOTE: 10 cubed= 1,000
2 cubed= 8 20 cubed= 8,000
3 cubed= 27 30 cubed= 27,000
4 cubed= 64
5 cubed= 125
6 cubed= 216
7 cubed= 343
8 cubed= 512
9 cubed= 729
10 cubed= 1000
What is the cube root of 10,648? Start by looking at the thousands, 10 in this example. 10 lies between 2 cubed and 3 cubed so the cube root lies in the 20s. See above 20 cubed is 8,000 and 30 cubed is 27,000. Next look at 648 and notice that only the cube of 2 ends in an 8 so the answer is 22.
What is the cube root of 405,224?
405 thousands lies between 7 and 8 cubed so the first part of the answer is 7. Only 4 cubed ends in 4 so the answer must be 74.
I hope you enjoyed this simple trick.
Chris.