Addition and subtraction within 20 - Subtraction crossing 10 2 - Worksheet

The worksheet in question is tailored for Year 6 students to enhance their fluency and precision in subtraction, specifically focusing on the concept of 'crossing 10'. The National Curriculum objective covered in this lesson includes reading, writing, and interpreting mathematical statements with addition, subtraction, and equals signs, as well as adding and subtracting one-digit and two-digit numbers up to 20, inclusive of zero. To facilitate learning, practical equipment such as Base 10 is recommended, enabling children to visually differentiate between hundreds, tens, and ones. The lesson also provides differentiated sheets and teaching slides to accommodate varying levels of understanding.

Key vocabulary such as 'subtraction', 'crossing the 10', 'manipulatives', and 'pictorial methods' is introduced to help students articulate their mathematical processes. The exercises encourage children to explore different structures of subtraction, including taking away, partitioning, and finding the difference. By using manipulatives and pictorial representations, such as tens frames, children can better grasp the concept of subtraction, especially when it involves calculating how many more of one item there is compared to another. The worksheet prompts critical thinking through key questions, urging students to reflect on how they use counters, bar models, and various methods to represent and solve subtraction problems, and whether they find it more intuitive to count forwards or backwards to find the answer.