Rachel Riley on Instagram: "PUZZLES BELOW! My all time favourite tip/trick! I love teaching this in schools because you can get kids to try a game before they know the trick, and then within half an hour they can go from randomly timesing numbers together with no method in mind, to smashing these targets with a mathematician mindset! Here are some games to practice on, and remember 2.10pm every weekday play along on @channel4 🤗 A) 25 4 5 9 9 1 —> 405 B) 50 9 5 1 3 1 —> 369 C) 100 9 5 7 2 4 —> 8