Comprehensive Year 4 resources for adding and subtracting 1s, 10s, 100s, and 1000s to 4-digit numbers, promoting mental calculation and place value strategies, a core KS2 Maths objective. Activities build reasoning by requiring pupils to identify the digit affected by the operation, supporting calculation efficiency. This crucial small step supports mastery of place value and is vital for meeting national curriculum expectations. The CS Maths Scheme provides structured Base 10 and pictorial practice.