This resource outlines a comprehensive 5-day curriculum for teaching 3rd-grade students about Place Value as part of the Florida B.E.S.T. Standards. Each day is themed as a mission in space, engaging students in activities designed to enhance their understanding of number sense and place value through various forms: standard, expanded, and word form. The document includes specific missions for each day, hands-on activities using Base-10 blocks, and strategies for comparing and ordering numbers. It also provides a structured approach to classroom management and assessment procedures, ensuring students build mastery in identifying and manipulating numbers up to 10,000. Furthermore, the curriculum encourages creativity through a STEM challenge where students design a skyscraper representing a 4-digit number, reinforcing their learning with practical applications.