The operation to find the total of different values is called addition.

● When we sum up two or more amounts we use addition.

● The sign of addition is +

● Add numbers in any order, we get the same sum. e.g.

5 + 6 + 7 = 18

6 + 7 + 5 = 18

7 + 5 + 6 = 18

● Zero added to any number gives the same number. e.g.

8 + 0 = 8

0 + 10 = 10

32 + 0 = 32

0 + 88 = 88

● Add 1 to a number, we get the next number. e.g.

11 + 1 = 12

40 + 1 = 41

1 + 76 = 77

1 + 99 = 100

**Add:**

5 + 0 =

0 + 25 =

15 + 1 =

68 + 1 =

22 + 8 + 5 =

5 + 8 + 22 =

8 + 5 + 22 =

5 + 4 + 3 + 2 =

6 + 7 + 5 + 0 =

9 + 1 + 4 + 7 =

**Expand and add:**

(i)

30 + 7 30 + 20 50 |
+ + + 59 |
20 + 2 7 + 2 9 |

(ii)

** 245 + 652**

200 + 40 + 5 + 600 + 50 + 2

200 + 600 + 40 + 50 + 5 + 2

800 + 90 + 7

897

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.

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

**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.

Workings:

**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.

**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)**

**(ii)**

**Answer:**

**2. (i)**

**(ii)**

**3. Fill in the missing numbers:**

**Answer:**

**3.**

**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

**5. Write 'T' for True and 'F' for False
Statement:**

(i) The sum is always greater than the numbers being added.

(ii) When we change the order of number while adding the sum does change.

(iii) The sum of zero and any number is the number before it.

(iv) When you add 1 to a number the answer is the number after it.

**Answer:**

**5. **(i) T

(ii) F

(iii) F

(iv) T

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