# 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:

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) is representing the number 36.

 (ii) is representing the number ____.

 (iii) 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.

Counting ones together and tens together, we get

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.

Counting ones together and tens together, we get

Thus, we get 23 + 45 = 68.

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          O4          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           O5           4+           35           7 (ii) T           O4           6+           2
 (iii) T           O7           8+           1 (iv) T           O3           2+           6
 (v) T           O1           7+           2 (vi) T           O4           3+           4
 (vii) T           O6           2+           6 (viii) T           O9           1+           7
 (ix) T           O7           1+           5 (x) T           O9           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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