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Adding Tens and Ones

We will learn adding tens and ones.

Basic Ones and Tens Blocks:

Following are the examples of Basic Ones and Tens Blocks:

Basic Ones and Tens Blocks

Look at the picture and complete the following sentence.

This picture has _____ ones and _____ Tens.

oh! Yes, there are 8 ones and 2 Tens in this picture.

Every number can be represented by using Basic Blocks.

Now fill-up these boxes. One has been completed for you.

(i)

Tens and Ones Blocks



is representing the number 36.


(ii)

Tens and Ones Blocks Number



is representing the number ____.


(iii)

Number Tena and Ones Blocks



is representing the number ____.


(iv)


Draw the basic blocks to represent the number 81.



(v)


Draw the basic blocks to represent the number 27.



Larger numbers can be easily added by using Basic Blocks of Tens and Ones.

Let us add 51 and 28.

51 = 5 tens and 1 ones.

28 = 2 tens and 8 ones.

We represent these numbers by the following pictures.

Numbers Addition Blocks

Counting ones together and tens together, we get

Addition using Number Blocks

Thus, we get 51 + 28 = 79


Similarly, we can add 23 and 45.

23 = 2 tens and 3 ones.

45 = 4 tens and 5 ones.

We represent these numbers by the following pictures.

Addition Blocks


Counting ones together and tens together, we get

Addition using Blocks

Thus, we get 23 + 45 = 68.


Adding Tens:

Adding Tens


Write in expanded form and find the sum and arrange the numbers in columns. Add the digits in ones and tens column.

1. Add the following digits in ones and tens column. One has been done for you.

(i)


43   =   4 tens   +   3 ones

 14   =   1 tens   +   4 ones 

 57   =   5 tens   +   7 ones 


T          O

4          3

 1          4 

 5          7 

(ii)


26   =   __ tens   +   __ ones

 52   =   __ tens   +   __ ones 

__________________________

 __   =   __ tens   +   __ ones 

__________________________


T          O

__          __

 __          __ 

____________

 __         __ 

____________

(iii)


51   =   __ tens   +   __ ones

 27   =   __ tens   +   __ ones 

__________________________

 __   =   __ tens   +   __ ones 

__________________________


T          O

__          __

 __          __ 

____________

 __         __ 

____________

(iv)


83   =   __ tens   +   __ ones

 14   =   __ tens   +   __ ones 

__________________________

 __   =   __ tens   +   __ ones 

__________________________


T          O

__          __

 __          __ 

____________

 __         __ 

____________

(v)


37   =   __ tens   +   __ ones

 52   =   __ tens   +   __ ones 

__________________________

 __   =   __ tens   +   __ ones 

__________________________


T          O

__          __

 __          __ 

____________

 __         __ 

____________

(vi)


26   =   __ tens   +   __ ones

 61   =   __ tens   +   __ ones 

__________________________

 __   =   __ tens   +   __ ones 

__________________________


T          O

__          __

 __          __ 

____________

 __         __ 

____________

(vii)


11   =   __ tens   +   __ ones

 77   =   __ tens   +   __ ones 

__________________________

 __   =   __ tens   +   __ ones 

__________________________


T          O

__          __

 __          __ 

____________

 __         __ 

____________

(viii)


55   =   __ tens   +   __ ones

 32   =   __ tens   +   __ ones 

__________________________

 __   =   __ tens   +   __ ones 

__________________________


T          O

__          __

 __          __ 

____________

 __         __ 

____________

(ix)


26   =   __ tens   +   __ ones

 62   =   __ tens   +   __ ones 

__________________________

 __   =   __ tens   +   __ ones 

__________________________


T          O

__          __

 __          __ 

____________

 __         __ 

____________

(x)


67   =   __ tens   +   __ ones

 21   =   __ tens   +   __ ones 

__________________________

 __   =   __ tens   +   __ ones 

__________________________


T          O

__          __

 __          __ 

____________

 __         __ 

____________


Addition of a 2-digit and a 1-digit numbers. 

1. Find the sum of the following: One has been done for you.

(i)

T           O

5           4

+           3

5           7

(ii)

T           O

4           6

+           2

              

(iii)

T           O

7           8

+           1

               

(iv)

T           O

3           2

+           6

              

(v)

T           O

1           7

+           2

               

(vi)

T           O

4           3

+           4

              

(vii)

T           O

6           2

+           6

               

(viii)

T           O

9           1

+           7

              

(ix)

T           O

7           1

+           5

               

(x)

T           O

9           5

+           4

              


Addition of two 2-digit numbers. 

2. Find the sum of the following: One has been done for you.

(i)

           T           O

           1           6

    +     7           3

           8           9

(ii)

           T           O

           2           3

    +     4           5

           ________   

(iii)

           T           O

           7           3

    +     2           4

           ________   

(iv)

           T           O

           3           5

    +     4           1

           ________   

(v)

           T           O

           3           7

    +     4           1

           ________   

(vi)

           T           O

           2           0

    +     3           9

           ________   

(vii)

           T           O

           1           6

    +     8           2

           ________   

(viii)

           T           O

           1           4

    +     5           2

           ________   

(ix)

           T           O

           4           5

    +     4           3

           ________   

(x)

           T           O

           1           7

    +     7           2

           ________   



Addition of three 2-digit numbers. 

3. Find the sum of the following: One has been done for you.

(i)

           T           O

           2           3

           3           0

    +     4           2

           9           5  

(ii)

           T           O

           3           5

           4           0

    +     1           3

           ________   

(iii)

           T           O

           5           2

           2           3

    +     2           1

           ________   

(iv)

           T           O

           4           3

           1           3

    +     3           2

           ________   

(v)

           T           O

           4           0

           2           7

    +     3           2

           ________   

(vi)

           T           O

           4           6

           3           2

    +     2           1

           ________   

(vii)

           T           O

           3           1

           2           0

    +     1           9

           ________   

(viii)

           T           O

           4           2

           1           4

    +     3           2

           ________   

(ix)

           T           O

           2           2

           5           6

    +     2           1

           ________   

(x)

           T           O

           1           5

           5           1

    +     1           2

           ________   

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