Here is a fun trick Last Friday I went to my M3 math class.My teacher toght us how to do a trick with numbers.First you make cards  with 1 on the back and 2 on the back.Then you make a card with 3 on the front and 4 on the back.You probabally gat the point.You keep on doing that untill you get to 10.After that yoou need to get someone to put all the cards on a table and put the cards anyway they want facing up.First the other person ask how many cards facing up are odds.Then you know how many evens there are so you think of numbers over 25 and get the answer.I hope you can find out how to get the answer.