An array in fourth grade math is a visual model used to help provide an understanding of multiplication concepts. For example, a multiplication problem can be represented with an array of shapes in rows and columns that are accompanied by a numerical formula, providing better understanding for students.
Arrays are also used in third grade math. An example of a visual array used in multiplication is four rows of stars in three columns, totalling 12 stars in total. This is described as a four by three array. In second grade, students often use equal groups to multiply. This concept is used to introduce students to arrays and to multiplication.