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

Designed to enhance the fluency and precision of Year 6 students in mathematics, this worksheet focuses on adding and subtracting three-digit and two-digit numbers, specifically multiples of 10, without crossing the 100 threshold. The National Curriculum objective is for students to add and subtract numbers mentally, including a three-digit number and tens. To facilitate this, differentiated worksheets and teaching slides are provided as resources. Students are encouraged to use mental methods throughout the lesson.

Key vocabulary includes terms such as 'add', 'subtract', 'multiple', 'mental methods', 'exchanging', 'patterns', 'columns', and 'calculations'. Students explore the effects of adding or subtracting multiples of 10 to a three-digit number using various representations like Base 10, arrow cards, and place value charts. The column method is also introduced, but students are prompted to consider whether it is necessary and to explain their reasoning. The lesson aims to deepen understanding by asking questions like "How many tens can we add to 652 without exchanging?" and "What patterns can you see between the additions and subtractions?" To consolidate learning, children engage in reasoning and problem-solving activities, such as finding mistakes in calculations and explaining concepts, with an emphasis on visual aids like place value charts to aid comprehension.