Addition and subtraction - 10 more and 10 less - Worksheet

The lesson on "10 More and 10 Less" is designed to enhance students' ability to add and subtract tens from two-digit numbers, using a variety of methods including concrete objects, pictorial representations, and mental calculations. The resources provided for this lesson include differentiated worksheets and teaching slides to cater to various learning levels. Key vocabulary terms such as 'add', 'subtract', 'digit', 'tens', 'ones', '10 more', '10 less', 'pattern', and 'columns' are crucial for understanding the concepts. The teaching emphasises the role of the tens digit and encourages exploration using a 100 square to observe patterns in the numbers. Students are prompted to notice that while the tens digit changes when adding or subtracting ten, the ones digit remains the same. This understanding is reinforced through the use of concrete materials before progressing to more abstract concepts.

The worksheets offer a range of activities, from colouring in numbers that are 10 more or 10 less than a given number, to completing number tracks and solving problems that involve finding 10 more or 10 less. The exercises are designed to help children recognise the consistent pattern that occurs when manipulating the tens column. For deeper engagement, reasoning and problem-solving tasks challenge students to apply their knowledge in different scenarios, such as adjusting prices by 10p or determining the remaining number of pencils after giving some away. The arithmetic section includes a series of calculations for students to practice adding or subtracting ten from various numbers, further solidifying their understanding of the concept. The lesson concludes with solutions provided for the exercises, ensuring that students can check their work and understand any mistakes made.