Chapter 2 Addition: Concepts, Examples, and Practice Questions for Class 3

Class 3 Maths Chapter 2 opens the door to the exciting world of addition. Building on what students already know about adding small numbers, this chapter teaches them how to combine numbers confidently, use number bonds, and add larger amounts using step-by-step methods. Addition is everywhere, in counting sweets, joining teams on the playground, adding marks in a test, or totalling money while shopping. This friendly guide explains every concept from the chapter in simple language, with clear examples, fun real-life connections, helpful tips, and free printable worksheets at the end to practise and master addition.

Table of Contents

• Addition Without Regrouping
• Adding a 3-Digit Number and a 1- or 2-Digit Number with Regrouping
• Adding Two 3-Digit Numbers with Regrouping
• Adding Three or More 3-Digit Numbers with Regrouping
• Special Facts of Addition
• Addition Word Problems for Class 3

Addition Without Regrouping

In Class 2, we learnt addition without regrouping where digits in each column add up to less than 10 and nothing needs to be carried.

Example: Add 203 and 491

H  T  O

  2  0  3

+ 4  9  1

---------

  6  9  4

• Ones: 3 + 1 = 4 

• Tens: 0 + 9 = 9 

• Hundreds: 2 + 4 = 6

Simple and clean. No carrying needed. Now it's time to explore addition with carry forward and see how it makes adding larger numbers easier.

Adding a 3-Digit Number and a 1- or 2-Digit Number with Regrouping

Regrouping (carrying over) happens when digits in a column add up to 10 or more. The key rule to remember:

Always start adding from the ones place, then move to the tens place, and then to the hundreds place.

Example 1: Add 203 and 7

H  T  O

     1

2   0   3

+       7

---------

Step 1: Ones place: 3 + 7 = 10. Write 0 in the ones place. Carry 1 to the tens place.

Step 2: Tens place: 1 + 0 = 1. Write 1 in the tens place.

Step 3: Hundreds place: Bring down 2.

H  T  O

     1

  2  0  3

+       7

---------

  2  1  0

203 + 7 = 210

Example 2: Add 267 and 54

H  T  O

 1  1

 2  6  7

+   5  4

---------

Step 1: Ones place: 7 + 4 = 11. Write 1 in the ones place. Carry 1 to the tens place.

Step 2: Tens place: 1 + 6 + 5 = 12. Write 2 in the tens place. Carry 1 to the hundreds place.

Step 3: Hundreds place: 1 + 2 = 3. Write 3 in the hundreds place.

H  T  O

 1  1

 2  6  7

+   5  4

---------

  3  2  1

267 + 54 = 321

Adding Two 3-Digit Numbers with Regrouping

Example 1: Add 328 and 235

  H  T  O

       1

  3  2  8

+ 2  3  5

---------

• Step 1: Ones place: 8 + 5 = 13. Write 3 in the ones place. Carry 1 to the tens place.

• Step 2: Tens place: 1 + 2 + 3 = 6. Write 6 in the tens place. No carry needed.

• Step 3: Hundreds place: 3 + 2 = 5. Write 5 in the hundreds place.

 H  T  O

       1

  3  2  8

+ 2  3  5

---------

  5  6  3

328 + 235 = 563

Adding Three or More 3-Digit Numbers with Regrouping

Example 1: Add 455 + 259 + 135

  H  T  O

  1  1

  4  5  5

  2  5  9

+ 1  3  5

---------

• Step 1: Ones place: 5 + 9 + 5 = 19. Write 9 in the ones place. Carry 1 to the tens place.

• Step 2: Tens place: 1 + 5 + 5 + 3 = 14. Write 4 in the tens place. Carry 1 to the hundreds place.

• Step 3: Hundreds place: 1 + 4 + 2 + 1 = 8. Write 8 in the hundreds place.

 
H  T  O

  1  1

  4  5  5

  2  5  9

+ 1  3  5

---------

  8  4  9

455 + 259 + 135 = 849

Special Facts of Addition

The Class 3 textbook introduces some very useful ‘facts’ or rules about addition. 

Fact 1: Adding 1

When we add 1 to any number, we get the very next number (the number that comes just after it).

259 + 1 = 260

1 + 999 = 1,000

Fact 2: Adding 100

When we add 100 to any number, only the digit in the hundreds place increases by 1. The rest stays the same.

952 + 100 = 1,052

741 + 100 = 841

Fact 3: Order of Addition (Commutative Property)

Two or more numbers added in any order always give the same sum. So the order doesn't matter.

195 + 140 = 140 + 195 = 335

356 + 409 + 227 = 227 + 356 + 409 = 992

Addition Word Problems for Class 3

Problem 1: There were 436 passengers on a train. At a station, 25 more passengers boarded. How many passengers are there on the train now?

Solution:

  H  T  O

     1

  4  3  6

+    2  5

---------

  4  6  1

There are 461 passengers on the train now.

Problem 2: In a garden, there are 345 rose plants. The gardener planted 57 more plants. How many plants are there in the garden now?

Solution:

  H  T  O

     1

  3  4  5

+    5  7

---------

  4  0  2

There are 402 plants in the garden now.

Problem 3: In a library, there are 269 storybooks, 454 Science books, and 328 History books. How many books are there in all?

Solution:

  H  T  O

  1  1

  2  6  9

  4  5  4

+ 3  2  8

---------

  1  0  5  1

There are 1,051 books in the library in all.

Problem 4: There are 743 girls and 658 boys in a school. How many students are there in total?

Solution:

  Th  H  T  O

       1  1

     7  4  3

   + 6  5  8

  ----------

   1  4  0  1

There are 1,401 students in the school.

Problem 5: A baker sold 563 cupcakes on Monday. On Tuesday, he sold 67 more cupcakes than he sold on Monday. How many cupcakes did the baker sell on Tuesday?

Solution: Cupcakes sold on Tuesday = 563 + 67

  H  T  O

     1

  5  6  3

+    6  7

---------

  6  3  0

The baker sold 630 cupcakes on Tuesday.

Here's a set of questions for practice. Solve them in a notebook with proper column layout.

Worksheet on Chapter 2: Addition for Class 3