https://padlet.com/pvennebush/greatproblems Share great problems you've used in your classroom. en-us 2018-10-17 19:26:28 UTC 2025-10-20 03:54:39 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Lightdecrease.png pvennebush https://padlet.com/pvennebush/greatproblems/wish/294069594 1000 students enter a school. First opens all 1000 lockers. Second closes every 2nd locker. Third "changes the state" of every 3rd locker -- opens if it's closed, closes if it's open. Fourth "changes the state" of every 4th locker. And so on, for all 1000 students. Which lockers are open at the end?]]> 2018-10-17 19:28:36 UTC https://padlet.com/pvennebush/greatproblems/wish/294069594