Targeted Year 2 resources for securing number bonds up to 100 in multiples of 10 (e.g., 30 + 70 ), a core KS1 Maths objective for mental arithmetic. Activities build conceptual understanding of the link between number bonds to 10 and number bonds to 100, promoting reasoning. This essential small step supports varied fluency and is vital for meeting national curriculum expectations for calculation efficiency. The CS Maths Scheme provides structured ten frame and hundred square practice.