Table of Contents
Operations on Numbers
Have you ever tried adding two numbers together? It is usually easy. However, when there are a lot of objects lying around, addition can be made very easy by arranging them in arrays.
What are arrays?
Arrays are objects, numbers, or pictures lined up in rows or columns.
When an array of objects is placed one after the other horizontally, it is called a row. When an array of objects is placed one after the other vertically, it is called a column.
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Solved Examples
Question 1:
Mention the number of candies shown in each row.
(a)
Solution:
Let’s consider each row in this scenario. There are three red candies in each row. Let’s add the total number of candies.
3 + 3 + 3 = 9
So, there are 9 candies in total.
(b)
Let’s count the number of candies in each row. In each row, there are 5 candies. There are a total of three rows. So, the total number of candies is,
5 + 5 + 5 = 15
Hence, there are a total of 15 candies.
Question 2:
Find out the total number of candies in each column.
(a)
Solution:
There are a total of 7 columns and each column has 2 candies. The total number of candies is 2 + 2 + 2 + 2 + 2 + 2 + 2 = 14
So, the total number of candies is 14.
(b)
In each column, there are 4 candies. There are 8 columns. Now let us calculate the total number of candies.
4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 32
Hence, there are a total of 32 candies.
Question 3:
The figure below shows the different arrays of mango trees and apple trees in a garden. Which of the two types has the greater number of trees?
Solution:
There are four mango trees in each row. There are four rows of trees as well. This means that the total number of mango trees is:
4 + 4 + 4 + 4 + 4 = 16
There are six apple trees in each row. In total, there are three rows. Hence, the total number of apple trees is:
6 + 6 + 6 = 18
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Sometimes there may be a requirement to count a large number of items of the same kind. For instance, while working in a supermarket, provision store, or even a factory. Sometimes one needs to count the number of objects one by one or verify the number of these items from time to time. Arranging the items in arrays makes this process much easier and saves a lot of time.