Addition of Three 2-Digit Numbers

Here we will discuss about the addition of three 2-digit numbers.

Look at the following abacuses:

Addition of Three 2-Digit Numbers on Abacus

How many beads are there in all the three abacuses?



Add the Beads in Ones Spike Together

Step I: First add the beads in ones spike together.

            3 + 2 + 3 = 8

Add the Beads in Tens Spike Together

Step II: Add the beads in tens spike together

             4 + 1 + 4 = 9

       Thus, 43 + 12 + 43 = 98.


Answer: There are 98 beads in all the three abacuses.

Adding Three 2-Digit Numbers with Regrouping:

Adding Three 2-Digit Numbers

1. Let us add 14, 26 and 35.

Write the numbers one below the other as shown.

Step I: Add the ones.

4 ones + 6 ones + 5 ones = 15 ones

Regroup: 15 ones = 1 ten and 5 ones

Write 5 in the ones place.

Carry over ten and write it under 'T',


Step II: Add the tens.

1 ten (carried over) + 1 ten + 2 tens + 3 tens = 7 tens

Write 7 in the tens place.

The sum is 75.


2. John, Mack and Maria are reading books. John has read 35 pages, Mack has read 28 pages and Maria has read 24 pages. How many pages did they read in all?

Adding Three 2-Digit Numbers

35 + 28 + 24 = ?

Step I: Add the ones.

5 + 8 + 4 = 17 ones

Regroup and carry over 1 ten

Write 7 under ones column.

Adding 3 Two-Digit Numbers

Step II: Add the tens.

3 + 2 + 2 + 1 = 8 tens

Write 8 under tens columns.

So, they read 87 pages altogether.


Worksheet on Addition of Three 2-Digit Numbers:

1. Add the following three 2-digit numbers without regrouping:

(i)

          T     O

          3     2

          1     4

     +   2     3

                   

(ii)

          T     O

          1     5

          2     2

     +   5     1

                   

(iii)

          T     O

          2     4

          3     1

     +   4     3

                   

(iv)

          T     O

          3     3

          4     2

     +   2     4

                   

Answer:

1. (i) 69

(ii) 88

(iii) 98

(iv) 99


2. Add the following three 2-digit numbers:

(i) 12 + 23 + 46 = _____

(ii) 24 + 15 + 18 = _____

(iii) 30 + 17 + 12 = _____

(iv) 48 + 21 + 17 = _____

(v) 62 + 11 + 18 = _____

(vi) 41 + 24 + 18 = _____

(vii) 56 + 16 + 26 = _____

(viii) 18 + 27 + 31 = _____

(ix) 12 + 48 + 24 = _____

(x) 27 + 11 + 39 = _____

(xi) 21 + 15 + 27 = _____

(xii) 18 + 22 + 36 = _____

(xiii) 26 + 25 + 27 = _____

(xiv) 33 + 49 + 9 = _____

(xv) 39 + 24 + 25 = _____

(xvi) 43 + 35 + 16 = _____

(xvii) 68 + 13 + 8 = _____

(xviii) 45 + 16 + 19 = _____

(xix) 18 + 24 + 29 = _____

(xx) 25 + 25 + 25 = _____


Answer:

2. (i) 81

(ii) 57

(iii) 59

(iv) 86

(v) 91

(vi) 83

(vii) 98

(viii) 76

(ix) 84

(x) 77

(xi) 63

(xii) 76

(xiii) 78

(xiv) 91

(xv) 88

(xvi) 94

(xvii) 89

(xviii) 80

(xix) 71

(xx) 75



2nd Grade Math Practice

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