Advanced Year 2 resources for adding two 2-digit numbers across a 10 boundary, introducing informal column addition strategies, a key KS1 Maths objective. Activities employ the CPA approach to build conceptual understanding of bridging ten and regrouping, promoting reasoning. This crucial small step supports deepening understanding of addition and is vital for national curriculum calculation mastery. The CS Maths Scheme provides structured Base 10 and pictorial support.