The Large number carry model is a practical teaching tool that helps students understand the rules of carrying large numbers, usually composed of building blocks with numerical identifiers. In the teaching process, building blocks of different lengths represent different numbers. When performing addition operations and encountering a situation where the number reaches ten, the 10 building blocks can be strung together and carried up to the next higher digit, vividly demonstrating the concept of "ten in one". By using such models, students can clearly see the changes in numbers and the accumulation of numerical values, effectively improving their understanding and mastery of large number operations.