Welcome to my 90th gems post. This is where I share some of the latest news, ideas and resources for maths teachers. 1. Probability TaskThanks to John Rowe (@MrJohnRowe) for sharing this challenging probability puzzle. If you like this then you’ll find similar tasks for a wide range of topics on the fantastic website openmiddle.com which I’ve blogged about before. 2. Exam Wrapper Thanks to Alice Leung (@aliceleung) for sharing an exam wrapper for students to complete after an assessment. I like it…