3 balls in a row pattern- NRICH

Teddy Bear’s Picnic Challenge I have a combination of teddy bears that have two legs and fluffy dogs that have{...}

Watch Caps for Sale https://www.youtube.com/watch?v=INptSCKqdfg While this is playing stop it at different points. If all the grey hats were{...}

Launch: Inside these three boxes I have 8 counters. How many are in each box?  What strategies can you use{...}