Build children’s number sense with this Year 1 Understand 20 Reasoning and Problem Solving worksheet. This resource supports children in developing a secure understanding of the number 20, strengthening their place value skills. Pupils will be encouraged to explain whether two statements are correct or not and find more than one solution to the problem solving question. Perfect for independent tasks, small group work or paired discussions. This resource also includes an answer sheet to support self and peer assessment. Download now!