Challenging Year 4 resources for correspondence problems (finding the number of combinations, e.g., items in one set and items in another), applying multiplication and reasoning skills, a key KS2 Maths objective. Activities build deepening understanding of the multiplicative relationship between sets and combinatorial logic. This crucial small step supports mastery of complex multiplication application and is vital for national curriculum expectations. The CS Maths Scheme provides structured visual and problem-solving tasks.