One line of an array, used to calculate area by using repeated addition is called a

One line of an array, used to calculate area by using repeated addition is called a

• A. unit square
• B. row
• C. composite unit
• D. column

Answer: (C)

In area models, an array is made of unit squares, and a line in that array is a group of several unit squares joined together. That line can be treated as one block when you count area by repeated addition, so it’s called a composite unit. For example, a row that has four unit squares forms one composite unit of size four. To find the total area, you add that composite unit as many times as there are rows (three rows in a 3 by 4 rectangle), which is 4 + 4 + 4 = 12. A unit square is just one square, not the line. A row describes the orientation, and a column is the vertical line, but the line’s role as a single block made up of multiple units is what defines it as a composite unit.

In area models, an array is made of unit squares, and a line in that array is a group of several unit squares joined together. That line can be treated as one block when you count area by repeated addition, so it’s called a composite unit. For example, a row that has four unit squares forms one composite unit of size four. To find the total area, you add that composite unit as many times as there are rows (three rows in a 3 by 4 rectangle), which is 4 + 4 + 4 = 12. A unit square is just one square, not the line. A row describes the orientation, and a column is the vertical line, but the line’s role as a single block made up of multiple units is what defines it as a composite unit.