Addition and subtraction - Subtract a three-digit number from a three-digit number no exchange - Planning

The curriculum for Year 3 students in Autumn focuses on enhancing their addition and subtraction skills, specifically subtracting a three-digit number from another three-digit number without the need for exchange. The National Curriculum objectives cover mental arithmetic involving three-digit numbers, formal written methods of columnar addition and subtraction, estimation for calculation checks, and solving complex problems. Key vocabulary such as 'addition', 'subtraction', 'column addition', 'column subtraction', and 'exchange' are introduced to build a strong foundation in mathematical language. The lesson plan encourages the use of resources such as place value counters, grids, worksheets, and presentations to facilitate learning.

During the lesson, children begin by revisiting efficient subtraction strategies, including counting on using number lines, near subtraction, and number bonds. They then apply these strategies to formal column subtraction with practical equipment. Partner work and independent activities urge students to explore different methods, discuss efficiency, and deepen their understanding through explanation and reasoning. The lesson progresses to formal written column subtraction, emphasizing the importance of correctly aligning place value columns. Differentiated worksheets allow for independent practice, and the lesson concludes with reflection on the skills used, strategies learned, and how to check the correctness of their answers. The plan also outlines approaches for varying levels of understanding, from working towards the expected level to achieving greater depth in number calculations and representations.