Essential Year 1 resources for adding using number bonds within 20, focusing on 'bridging ten' to efficiently calculate, a core KS1 Maths strategy. Activities use the CPA approach to develop conceptual understanding of partitioning to make ten, leading to computational mastery. This vital small step supports varied fluency in mental arithmetic and is key to meeting national curriculum expectations for calculation efficiency. The CS Maths Scheme provides structured steps for securing the 'make ten' strategy.