Place value within 10 - Count one less - Presentation

Lesson 9 in the series focuses on the concept of counting one less within the context of place value for numbers up to 10. The lesson begins with a discussion prompting students to consider what 'one less' means, encouraging them to provide examples to solidify their understanding. A series of activities then guide the children through practical applications of this concept. In the first activity, students are asked to visually represent 'one less' than a given number, using pictures, numerals, or words to fill in the boxes. This hands-on approach helps to cement their understanding of the concept of decrementing by one.

Subsequent activities involve interactive elements such as rolling dice and using counters on a number track, where students represent a number and then determine what one less would be, completing sentences to reflect their findings. Another activity includes selecting number cards and completing a table that incorporates numerals, words, and a number track to reinforce the principle of counting backwards to find 'one less'. The lesson also includes reasoning tasks where students evaluate statements to determine their truthfulness and identify patterns in the numbers, such as recognising that 'one less' than any number is the number that comes before it when counting backwards. Independent work rounds off the lesson, where students are tasked with drawing, writing digits, and forming words to represent 'one less' for various numbers, further solidifying their grasp of the concept.