Dedicated Year 1 resources on addition facts within fact families, strengthening the understanding of number relationships, a key KS1 Maths objective. Activities encourage reasoning by showing how two addition facts are related by commutativity, leading to computational mastery. This small step supports varied fluency in recalling bonds to 10 and is essential for meeting national curriculum expectations. The CS Maths Scheme uses the part-whole model to consolidate this relational understanding.