What I learned on 11-10-12

 I learned about an easy strategy to find the sum of the  numbers 1 through 10. First visualize the numbers as stones and line them up in a column like this 1
                                                                                          12
                                                                                          123
and so on until you get to ten. Once that is done visualize that figure upside down attached to the first figure you've created, it should form a rectangle. The rectangle has 10x11 dimensions. Now multiply the dimensions to find the area, which is 110. After that is done, cut the area in half leaving you with 55. 55 is the answer to the sum of the numbers from 1 to 10. This can be done with any group of numbers.