PPT: We the Travellers - II | Mathematics (Maths Mela) Class 5 - New NCERT PDF Download

 Page 1


We the Travellers-II
Page 2


We the Travellers-II
Adding Numbers Using Place Value
A lorry has 28 litres of fuel in its tank. An additional 75 litres is filled. What is the total quantity of fuel in 
the lorry?
The total quantity of fuel in the tank is 28 l + 75 l.
Page 3


We the Travellers-II
Adding Numbers Using Place Value
A lorry has 28 litres of fuel in its tank. An additional 75 litres is filled. What is the total quantity of fuel in 
the lorry?
The total quantity of fuel in the tank is 28 l + 75 l.
Finding the Sum of Two Numbers
Q: Find the sum of 49 and 89.
When we add 49 + 89:
First add the ones: 9 + 9 = 18 (write 8, carry 1)
Then add the tens: 4 + 8 + 1 = 13
The sum is 138
Page 4


We the Travellers-II
Adding Numbers Using Place Value
A lorry has 28 litres of fuel in its tank. An additional 75 litres is filled. What is the total quantity of fuel in 
the lorry?
The total quantity of fuel in the tank is 28 l + 75 l.
Finding the Sum of Two Numbers
Q: Find the sum of 49 and 89.
When we add 49 + 89:
First add the ones: 9 + 9 = 18 (write 8, carry 1)
Then add the tens: 4 + 8 + 1 = 13
The sum is 138
Relationship Between Addition and 
Subtraction
Addition and subtraction are inverse operations.
If A + B = C, then:
C 3 A = B
C 3 B = A
If A 3 B = C, then:
C + B = A
A 3 C = B
Page 5


We the Travellers-II
Adding Numbers Using Place Value
A lorry has 28 litres of fuel in its tank. An additional 75 litres is filled. What is the total quantity of fuel in 
the lorry?
The total quantity of fuel in the tank is 28 l + 75 l.
Finding the Sum of Two Numbers
Q: Find the sum of 49 and 89.
When we add 49 + 89:
First add the ones: 9 + 9 = 18 (write 8, carry 1)
Then add the tens: 4 + 8 + 1 = 13
The sum is 138
Relationship Between Addition and 
Subtraction
Addition and subtraction are inverse operations.
If A + B = C, then:
C 3 A = B
C 3 B = A
If A 3 B = C, then:
C + B = A
A 3 C = B
Sums of Consecutive Numbers
Consecutive Numbers: Numbers following each other in order (e.g., 11, 12, 13, 14).
Rules:
Sum of 2 consecutive 
numbers ³ Always odd.
Sum of 3 consecutive 
numbers ³ Multiple of 3 
(odd/even depends on 
middle number).
Sum of 4 consecutive 
numbers ³ Always even.
Patterns:
For odd number of terms 
³ Sum = Middle Number 
× Number of Terms.
For even number of 
terms ³ Sum = (First 
Number + Last Number) 
× (Number of Terms ÷ 
2).
Difference Between 
Successive Sums = 
Number of terms.