A series of problem solving questions for lower ability year 9

These are a series of problems from a variety of freely shared resources, or self written. They are aimed at low ability yr 9, but some are taken from KS2 problems also. They are linked to topics and I use them as starters. I started this as a project and found that it increased pupils confidence in class and on exam papers. I do them on whiteboards so there is no concerns about having wrong answers in their books. Many thanks to all who post problems and share freely.