PPT: Vegetable Farm (Addition and Subtraction up to 20) | Mathematics Olympiad for Class 1 PDF Download

 Page 1


Vegetable Farm 
(Addition and 
Subtraction up 
to 20)
Page 2


Vegetable Farm 
(Addition and 
Subtraction up 
to 20)
Addition by Counting Forward
Addition
To add 6 and 3, we start from 6 and count 
forward by 3 as:
We reach at 9. So, 6 + 3 = 9.
Tips
It is easy to add if we start from the bigger 
number while doing addition by counting 
forward.
Page 3


Vegetable Farm 
(Addition and 
Subtraction up 
to 20)
Addition by Counting Forward
Addition
To add 6 and 3, we start from 6 and count 
forward by 3 as:
We reach at 9. So, 6 + 3 = 9.
Tips
It is easy to add if we start from the bigger 
number while doing addition by counting 
forward.
Addition on a Number Line
Using the Number Line
To add 7 and 3, we start from 7 on the 
number line and move 3 steps (ones) 
forward.
Finding the Sum
We reach at 10. So, 7 + 3 = 10.
Page 4


Vegetable Farm 
(Addition and 
Subtraction up 
to 20)
Addition by Counting Forward
Addition
To add 6 and 3, we start from 6 and count 
forward by 3 as:
We reach at 9. So, 6 + 3 = 9.
Tips
It is easy to add if we start from the bigger 
number while doing addition by counting 
forward.
Addition on a Number Line
Using the Number Line
To add 7 and 3, we start from 7 on the 
number line and move 3 steps (ones) 
forward.
Finding the Sum
We reach at 10. So, 7 + 3 = 10.
Vertical Addition
Arranging Numbers
To add 6 and 2, we arrange the numbers 
one below the other and add as we do by 
forward counting as shown.
Starting with Bigger Number
Start from the bigger number 6 and count 
forward by 2 as: So, 6 + 2 = 8.
Page 5


Vegetable Farm 
(Addition and 
Subtraction up 
to 20)
Addition by Counting Forward
Addition
To add 6 and 3, we start from 6 and count 
forward by 3 as:
We reach at 9. So, 6 + 3 = 9.
Tips
It is easy to add if we start from the bigger 
number while doing addition by counting 
forward.
Addition on a Number Line
Using the Number Line
To add 7 and 3, we start from 7 on the 
number line and move 3 steps (ones) 
forward.
Finding the Sum
We reach at 10. So, 7 + 3 = 10.
Vertical Addition
Arranging Numbers
To add 6 and 2, we arrange the numbers 
one below the other and add as we do by 
forward counting as shown.
Starting with Bigger Number
Start from the bigger number 6 and count 
forward by 2 as: So, 6 + 2 = 8.
Properties of Addition
1 2
Changing Order
While adding two numbers, 
the sum does not change, 
even if we change the order 
of the numbers.
Adding Zero
When we add 0 to a 
number, the sum is the 
number itself.