For secondary. Passing through the blog of Bill the Lizard saw some very interesting shows I want to share: Demo N ° 1: The sum of n odd numbers is n2. 1 + 3 + 5 + ... + (2n - 1) = n2 This is very clear 1 + 3 + 5 + ... [...]

For 6th primary and secondary 1st and 2nd. Some people may find it difficult to remember the signs law to make operations with integers, I have to do them a little story. All the inhabitants of the island of Signolia imprinted with a sign on their clothes. If you are good men are printed [...]

For 6th graders and high school 1st and 2nd. Whole numbers are not something the other world but this world is so common that sometimes do not notice. Here we see why it is important the study of whole numbers and uses are given daily. I think [...]

5th and 6th for elementary and secondary school 1st and 2nd. Natural numbers as its name suggests, arise from the nature and obviously fixed in the minds of men. We'll see how the natural numbers are part of us and it would be impossible not to know. Note to students: It is very important [...]