How can these models be used to find the sum of 2.3 + 1.94? First row. Two large squares, each divided into a 10 by 10 grid of 100 small squares. Three columns, each divided into 10 small squares. Second row. One large square divided into a 10 by 10 grid of 100 small squares. Nine columns, each divided into 10 small squares. Four small squares.