Addition and subtraction within 20 - Subtraction not crossing 10 counting back - Planning

In the Year 1 mathematics lesson focused on subtraction within 20, children are introduced to the concept of 'Subtraction not crossing 10 by counting back'. This lesson serves as part of the third week in the spring term's sequence on addition and subtraction within 20. The lesson commences with a review of prior knowledge, followed by an explanation of how to use a number line for subtraction. The children are presented with a word problem involving the subtraction of sweets, which sets the context for the lesson's activities. They are encouraged to identify the subtraction process by understanding that a decrease in quantity implies subtraction.

During the class, the students engage with a number line, learning to start from a given number—such as 16 sweets—and to 'hop' back the correct number of times without counting the initial number. This technique is practiced with various examples, reinforcing the skill of counting back to determine the remaining quantity. The children then work on differentiated worksheets independently to solidify their understanding. The plenary includes a 'Give me five' reflection, where students consider what they've learned, the skills they've used, the challenges they've encountered, and the support that aided their learning. They also make a 'Pinkie promise' to remember the key points from the lesson. The worksheets are tailored to cater to different learning levels, with some providing starting clues and others requiring children to order mixed-up number pieces to solve the subtraction problems.