Deepens an understanding of place value to three and four places. Because the unit is a simulation game, where students form companies that sell T-shirts packed in rolls of ten, and ten rolls to a pallet, many opportunities are provided for differentiation to deepen an understanding of place value. The t-shirts sell for $10 apiece and students have to keep track of both the inventory they have in their warehouse, and the amount of money they have made. It’s a great unit for working on addition and subtraction strategies based on place value within 1000.