🛍️ Rounding Marketplace Prototype & Revision Log

In small groups, students build Version 1 of their Rounding Marketplace booth using poster board, price tags with original 3–4 digit prices, rounded price labels (nearest 10 or 100), play money, and visible place value models (number lines or charts). Teams role-play quick transactions with a partner group acting as shoppers and record what users say, do, and struggle with on a structured feedback sheet. Groups then revise their booth (Version 2), correcting any rounding errors and improving clarity of explanations, and complete an iteration log explaining what was tested, what feedback was received, what changed, and why.