Some of these give me a run for my money!
When we are doing 'tricky choosing' maths on a Friday, quite often I will use a challenge like these. I always remind the children that when we are learning sometimes we get it wrong, and that's a good thing. Sometimes we can't solve a problem straight away and that's okay. These games can really test them but its important to encourage this type of challenge to enable them to be resilient. Of course sometimes they are just too tricky... and that's okay too.