Place value - Rounding to the nearest 10 - Presentation

The presentation focuses on the concept of rounding numbers to the nearest 10 and is structured to enhance both fluency and reasoning skills in place value. It begins with an activity where students identify multiples of 10 from a given set of numbers. This foundational understanding is crucial as it sets the stage for subsequent activities. Students are then challenged to determine which multiples of 10 surround particular numbers, aiding their comprehension of number positioning on the numerical scale. For instance, they explore the multiples of 10 that numbers like 41 through 49 and 91 through 99 fall between, which helps them visualise and grasp the concept of rounding.

Further activities require students to round numbers to the nearest 10 by considering their proximity to benchmark numbers such as 140 or 150. For example, students decide whether numbers like 143, 146, and 148 are closer to 140 or 150, reinforcing their understanding of the rounding process. The presentation also addresses what happens when a number is exactly in the middle, such as 45, and guides students through the decision to round up, in this case, to 50. Additional exercises include completing tables where students round numbers like 321 and 98 to the nearest 10, and reasoning tasks where they explore possible numbers that round to specific multiples of 10, such as 480, 210, or 600. Throughout the presentation, students are encouraged to articulate their thought processes and justify their answers, fostering a deeper understanding of place value and rounding principles.