Facts about Addition

The operation to find the total of different values is called addition. Let us know some facts about addition which will help us to learn to add 4-digit and 5-digit numbers.

1. Addition of small numbers can be done horizontally.

Example: 6 + 2 + 3 = 11


2. Large numbers are added in vertical columns (written under the place value chart).

Example:

                           Th     H     T     O

                             7     2     5     8

                             1     3     6     2

                    +       1     4     2     6

                     1       0     0     4     6

3. A zero added to a number does not change the place value of the number.

                               H     T     O

                               3     2     5

                       +                   0

                               3     2     5


4. The number or values being added are called addends and the answer is called the sum.

Facts about Addition


5. 1 added to a number gives the successor of the number as the sum.

Addition Facts


6. To find a missing addend in an addition sum, the given addend or the sum of all the given addends is subtracted from the given sum.

Addition Facts of Large Numbers

Workings:

Addition Fact

7. Changing the order of the addend in an addition sum does not change the answer.

Example: (i) 45 + 26 = 26 + 45 = 71

(ii) 3 + 2 + 6 = 6 + 2 + 3 = 11


8. While adding more than two numbers, we can group any two numbers first. It does not change the sum.

Example: 7 + (9 + 3) = 7 + 12 = 19

                        or

(7 + 3) + 9 = 10 + 9 = 19

This fact helps us to group any two addends to make addition easy.

Example: 

                                             = (95 + 5) + 23

                                             = 100 + 23

                                             = 123

 

Let us have a quick review of what we have learnt about addition of 3- digit number in the previous class.

To add 2- digit numbers, the numbers are written one below the others. The tens and ones digits should appear are below the other.

3rd Grade Addition Fact


Questions and Answers on 3rd Grade Addition Fact:

1. Solve the following sums and match them with the correct answer.

a. 20 + 5                            

b. 13 + 8   

c. 17 + 7                               

d. 12 + 1    

e. 14 + 6   

f. 9 + 9 

1. 20

2. 18

3. 21

4. 24

5. 13

6. 25

Answer:

1. a. → 6

b. → 3

c. → 4

d. → 5

e. → 1

f. → 2



2. Add the number of the middle circle with the number given in the inner circle. Write the sum in the outer circle:

(i)

Addition Circle Table


(ii)

Addition 10 Circle Table

Answer:

2. (i)

Addition Circle Table Answer

(ii)

Addition 10 Circle Table Answer

3. Fill in the missing numbers:

Missing Numbers in 2-Digit Addition

Answer:

3.

Missing Numbers in 2-Digit Addition Answer

4. Add the following numbers:

(i) 34 + 3 = _____

(ii) 53 + 12  = _____

(iii) 17 + 8  = _____

(iv) 46 + 18  = _____

(v) 60 + 11  = _____

(vi) 82 + 6  = _____

(vii) 72 + 22  = _____

(viii) 21 + 5  = _____


Answer:

4. (i) 37

(ii) 65

(iii) 25

(iv) 64

(v) 671

(vi) 88

(vii) 94

(viii)26

You might like these





3rd Grade Math Lessons

From Facts about Addition to HOME PAGE


New! Comments

Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.



Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.