This document outlines a Grade 4 lesson on visualizing numbers from 10,001 to 50,000. The lesson teaches students to use number discs representing 10,000s, 1,000s, 100s, 10s and 1s to visualize and represent whole numbers within this range. Students practice forming numbers with discs, writing numbers represented by configurations, and drawing number discs for given quantities in exercises and assignments designed to reinforce their understanding of visualizing four-digit numbers.