PPT: Addition and Subtraction of Whole Numbers

 Page 1


Addition and 
Subtraction 
of Whole 
Numbers
Page 2


Addition and 
Subtraction 
of Whole 
Numbers
Using a symbol to represent Missing 
Number or Operations
Missing Value
Finding the missing value is like a puzzle where we are given an operation and either a number 
or an operator symbol is missing, and we have to find that missing value.
We often use symbols like ¥ or ? to represent unknown values in equations. These symbols 
act as placeholders for the numbers we need to find.
Inverse Operations
To find unknown values, we use inverse operations. Addition and subtraction are inverse 
operations 3 one undoes the other, helping us solve for missing numbers.
Example 
In equations like 5 + ¥ = 12, we need to determine what number, when added to 5, gives us 12. 
So using inverse operation, we will get ¥ = 12 - 5, and thus our missing value would be, ¥ = 7
Page 3


Addition and 
Subtraction 
of Whole 
Numbers
Using a symbol to represent Missing 
Number or Operations
Missing Value
Finding the missing value is like a puzzle where we are given an operation and either a number 
or an operator symbol is missing, and we have to find that missing value.
We often use symbols like ¥ or ? to represent unknown values in equations. These symbols 
act as placeholders for the numbers we need to find.
Inverse Operations
To find unknown values, we use inverse operations. Addition and subtraction are inverse 
operations 3 one undoes the other, helping us solve for missing numbers.
Example 
In equations like 5 + ¥ = 12, we need to determine what number, when added to 5, gives us 12. 
So using inverse operation, we will get ¥ = 12 - 5, and thus our missing value would be, ¥ = 7
Let's Solve
Q u e s t i o n
Solve 7 + ¥ = 15
Page 4


Addition and 
Subtraction 
of Whole 
Numbers
Using a symbol to represent Missing 
Number or Operations
Missing Value
Finding the missing value is like a puzzle where we are given an operation and either a number 
or an operator symbol is missing, and we have to find that missing value.
We often use symbols like ¥ or ? to represent unknown values in equations. These symbols 
act as placeholders for the numbers we need to find.
Inverse Operations
To find unknown values, we use inverse operations. Addition and subtraction are inverse 
operations 3 one undoes the other, helping us solve for missing numbers.
Example 
In equations like 5 + ¥ = 12, we need to determine what number, when added to 5, gives us 12. 
So using inverse operation, we will get ¥ = 12 - 5, and thus our missing value would be, ¥ = 7
Let's Solve
Q u e s t i o n
Solve 7 + ¥ = 15
Solution
Identify the Equation
We have 7 + ¥ = 15, and we need to find the value 
of ¥.
Use Inverse Operation
To isolate the missing number, we subtract 7 from 
both sides of the equation.
Calculate
¥ = 15 - 7 = 8
The missing number is 8. When we add 7 and 8 
together, we get 15, which confirms our answer is 
correct.
Page 5


Addition and 
Subtraction 
of Whole 
Numbers
Using a symbol to represent Missing 
Number or Operations
Missing Value
Finding the missing value is like a puzzle where we are given an operation and either a number 
or an operator symbol is missing, and we have to find that missing value.
We often use symbols like ¥ or ? to represent unknown values in equations. These symbols 
act as placeholders for the numbers we need to find.
Inverse Operations
To find unknown values, we use inverse operations. Addition and subtraction are inverse 
operations 3 one undoes the other, helping us solve for missing numbers.
Example 
In equations like 5 + ¥ = 12, we need to determine what number, when added to 5, gives us 12. 
So using inverse operation, we will get ¥ = 12 - 5, and thus our missing value would be, ¥ = 7
Let's Solve
Q u e s t i o n
Solve 7 + ¥ = 15
Solution
Identify the Equation
We have 7 + ¥ = 15, and we need to find the value 
of ¥.
Use Inverse Operation
To isolate the missing number, we subtract 7 from 
both sides of the equation.
Calculate
¥ = 15 - 7 = 8
The missing number is 8. When we add 7 and 8 
together, we get 15, which confirms our answer is 
correct.
Let's Solve
1
The Problem
Find the missing operation: 10 ¥ 4 = 6