Targeted Year 3 resources for finding 10 or 100 more or less than a 3-digit number, a key KS2 Maths objective for place value and mental calculation. Activities build conceptual understanding of how only the tens or hundreds digit changes, promoting varied fluency and mental agility. This essential small step supports mastery of the number sequence and is vital for meeting national curriculum expectations. The CS Maths Scheme provides structured hundred square and pictorial practice.