Addition and subtraction - Add and subtract two-digit and ​three-digit numbers not crossing 10 or 100​ - Worksheet

This worksheet is designed to help Year 6 students master the art of adding and subtracting two-digit and three-digit numbers without crossing the thresholds of 10 or 100. The National Curriculum objective for this lesson is to solve problems, including missing number problems, using number facts, place value, and more complex addition and subtraction techniques. To facilitate this learning, differentiated worksheets are provided as resources. The vocabulary for the lesson includes terms such as 'add and subtract numbers', ensuring that children are familiar with the key concepts and terminology.

During the lesson, children are encouraged to focus on the position of numbers and their place value to accurately add and subtract two-digit and three-digit numbers. They will use Base 10 representations to line up the place value columns correctly and to ensure that the calculations are performed without the need for exchanging. Key questions posed include considerations about the placement of digits on the place value chart, the process of subtraction, and the similarities and differences between addition and subtraction. The worksheet tasks range from adding or subtracting two-digit numbers to or from three-digit numbers using pictorial representations, to matching calculations with their corresponding pictures, and finding missing numbers. The lesson aims to deepen understanding through reasoning and problem-solving activities, catering to various learning levels from 'Working Towards' to 'Greater Depth'.