Place value - Rounding to the nearest 100 - Presentation

Mastering the concept of rounding to the nearest hundred is an essential skill in place value, and a series of interactive activities are designed to help students grasp this concept. The first activity asks students to identify which numbers are multiples of 100, using a range of numbers from 200 to 1,500. This activity sets the foundation for understanding how to round numbers to the closest hundred. The subsequent activity challenges students to determine which multiples of 100 a series of numbers sit between, such as 210 to 290 and 810 to 890, further reinforcing their understanding of place value and rounding.

Further activities involve using a number line to decide if certain numbers are closer to 800 or 900, or 300 or 400, and then rounding them to the nearest hundred accordingly. For example, students are asked to round numbers like 337, 365, and 388, and understand why numbers up to 49 round down while those from 50 to 99 round up. The activities culminate in a reasoning challenge where students must deduce a number based on its rounded form to the nearest hundred and ten, fostering critical thinking in the context of place value. The lesson also prompts discussion on the similarities and differences between rounding to the nearest ten and hundred, and why the tens column is pivotal when rounding to the nearest hundred.