** Definition of Array**

- An Array is an arrangement of a set of numbers or objects in rows and columns.

**More about Array**

- An array is normally used to write multiplication and division number sentences.
- A multiplication array can easily be expressed as a repeated addition.
- A division array can easily be expressed as a repeated subtraction.

**Examples of Array**

- The dots in the above figure are arranged in 4 rows and 7 columns. It can also be written as 7 × 4 = 7 + 7 + 7 + 7 = 28.

- The cubes in the above figure are arranged in 4 rows and 9 columns. It can also be written as 9 × 4 = 9 + 9 + 9 + 9 = 36.

**Solved Example on Array**

Greg shaded the cells on a grid to make a rectangle, as shown. Which number sentence could be used to determine the total number of cells shaded to make the rectangle?

Choices:

A. 4 × 6 = 24

B. 1 × 25 = 25

C. 5 × 6 = 30

D. 30 × 3 = 90

Correct Answer: C

Solution:

Step 1:On the grid shown, the rectangle is 5 rows wide with 6 cells shaded in each row and there are 30 cells shaded in all.

Step 2:Number of rows × Number of cells shaded in each row = Total number of cells that make the rectangle

Step 3:5 × 6 = 30 [Substitute the values.]

Step 4:So, the number sentence that could be used to determine the total number of cells shaded to make the rectangle is 5 × 6 = 30.

**Related Terms for Array**

- Columns
- Data
- Element
- Order
- Rows