Dedicated Year 3 resources for adding and subtracting 10s or 1s to/from 3-digit numbers, reinforcing mental calculation and place value, a core KS2 Maths objective. Activities build conceptual understanding of how small adjustments affect the ones and tens digits, promoting varied fluency and mental agility. This essential small step supports mastery of 3-digit arithmetic and is vital for meeting national curriculum expectations. The CS Maths Scheme provides structured Base 10 and pictorial practice.