Juan built a sand castle like the one shown. The castle is shaped like a rectangular prism with a rectangular pyramid on top. How much sand did it take Juan to build it? He used in.3 of sand to build the castle.

Arrays are useful models for multiplication which can be used in a variety of ways, ranging from highly structured lessons to games and open investigations. An array is formed by arranging a set of objects into rows and columns. Each column must contain the same number of objects as the other columns, and each row must have the same number as the other rows.

The following array, consisting of four columns and three rows, could be used to represent the number sentence 3 x 4 = 12.