Develop knowledge of addition and subtraction with our Year 1 Missing Number Problems Teaching PowerPoint. Starting with a recap of fact families, this resource uses tens frames and number lines to help support children in finding missing numbers. To accompany our teaching slides, we've included a selection of fluency, reasoning and problem-solving questions, ideal for assessing children's understanding along the way. This resource links closely with our worksheets and be use for either main-class or small group teaching.