Class 3 Maths Chapter 2: Addition - Concepts, Examples & Worksheets

Class 3 Maths Chapter 2: Addition helps students strengthen their understanding of adding larger numbers with confidence. Building on the basics learned in earlier classes, this chapter introduces addition with and without regrouping, adding three-digit numbers, special addition facts, and solving everyday word problems.

In this guide, you'll learn each concept through simple explanations, step-by-step examples, practical applications, and printable worksheets that make learning addition enjoyable and help build strong calculation skills.

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
• Frequently Asked Questions of Chapter 2: Addition 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