What are Rows?
Rows are a group of items that are arranged in a horizontal order to ensure uniformity.
The arrangement of squares in the image is an example of a row where four items are arranged in a horizontal order.
What are Columns?
Columns are a group of items that are arranged in a vertical order to ensure uniformity.
The above arrangement of circles is an example of a column with objects placed from top to bottom in a uniform manner.
What are Arrays
Arrays are a combination of objects arranged in rows and columns.
As you can see from the image, the objects are combined in a uniform manner with both rows and columns.
What is the difference between Rows and Columns?
The differences between rows and columns are listed below:
- While rows are horizontal, columns are vertical
- The arrangement of rows is from the left to the right, but the arrangement of columns is from the top to the bottom
Solved Examples
Example 1: From the following arrangement in the image, find the number of rows and columns.
Solution:
As we can see from the arrangement, there are 3 horizontal rows and 6 vertical columns.
Hence, there are 3 rows and 6 columns.
Example 2: Marie has 5 rows of dominoes with 6 dominoes in each row. What is the total number of dominoes Marie has?
Solution:
As we know, there are 5 rows of dominoes and each row has 6 dominoes.
We can calculate the total number of dominoes by counting the number in each row and then adding.
So,
6 + 6 + 6 + 6 + 6 + 6 = 30
We can also multiply the number of rows by the count of dominoes in each row to find the total number of dominoes.
Thus,
\(5 \times 6 = 30\)
Hence, the total number of dominoes Marie has is 30.
Example 3: Find the number of objects in the image using only the number of rows.
Solution:
Here, there are 3 rows.
Each row has 3 objects.
So, we can write 3 + 3 + 3 = 9 objects in total.
Hence, there are 9 objects in these 3 rows in total.
Yes, the arrangement of rows and columns together is called an array.
While rows are horizontal arrangements, columns are vertical arrangements in a uniform manner.
The total number of items can be found by multiplying the number of rows by the number of items in each row.
An arrangement of flowers in a square garden or the arrangement of eggs in an egg tray are examples of arrays in real life.