Addition and subtraction - Add three-digit and ​two-digit numbers crossing 100 - Worksheet

The worksheet is designed to help Year 6 students master the skill of adding three-digit and two-digit numbers, especially when this addition results in crossing the hundred boundary, which is referred to as an exchange. The National Curriculum objective for this lesson is to add and subtract numbers mentally, including a three-digit number and tens. Students are provided with differentiated worksheets and teaching slides to aid their learning. The key vocabulary for this lesson includes terms such as add, subtract, multiple, mental methods, exchanging, patterns, columns, calculations, and compare. The students are encouraged to add multiples of ten to a three-digit number and to understand the concept of exchanging when the addition of tens changes the tens and hundreds columns.

Through reasoning and problem-solving activities, students tackle questions that involve addition with three-digit and two-digit numbers, with a focus on exchanges. They are guided step by step on how to represent an exchange on a place value chart, and how to use physical resources for support. The children apply their understanding to various tasks, including using a place value chart to explain the exchange process, completing bar models, and solving word problems involving 'Pirate Joe' adding bags of gold coins in multiples of ten. The exercises are designed to challenge students at different levels, from 'working towards' to 'greater depth', with the aim of enhancing their fluency, precision, and ability to solve more complex problems involving crossing ten.