This Year 5 Complements to 1 Discussion Problem is a great resource to use when your children are confident with finding complements to one. Our discussion problems are designed to be completed in small groups or in partners, and allow children to develop their reasoning and problem-solving skills. As this resource includes questions that are more difficult to answer than your standard question, we recommend children complete our other resources for this lesson first. An answer page that includes an example answer for each question is included with this worksheet, though more answers could be possible.