Comprehensive Year 1 resources for solving one-step problems involving addition and subtraction within 20, a core KS1 Maths objective for applying arithmetic skills. Activities promote problem-solving and reasoning skills by providing varied word problems, ensuring national curriculum mastery in applying calculation to context. This small step is vital for all pupils and is structured to build confidence in tackling written problems. The CS Maths Scheme provides a wide range of contextual application tasks.