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.

**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

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