Page 29 - ICSE Math 4

Addition
3 Addition

Learning Outcomes

Students will be able to learn:
 to add numbers (up to four digits) with or without regrouping.
 addition facts.
 to add numbers using expanded form.
 to estimate the sum of two or more numbers and their verifi cation.
 to solve word problems involving addition in real-life contexts.
 to frame word problems based on a mathematical statement on addition.

We have already learnt how to add 1-digit, 2-digit and 3-digit numbers. Let's learn how to

add 4-digit numbers.
Addition of Numbers (without carry over)

To add numbers, we fi rst add the ones, followed by the tens, the hundreds, and so on.
Example 1: Add 3,123; 1,242 and 4,314.

Solu on: Step 1: Add the ones and write the Step 2: Add the tens and write the
sum under the ones place. sum under the tens place.
3 + 2 + 4 = 9 2 + 4 + 1 = 7
Th H T O Th H T O

3 1 2 3 3 1 2 3

1 2 4 2 1 2 4 2

+ 4 3 1 4 + 4 3 1 4

9 7 9

Step 3: Add the hundreds and write Step 4: Add the thousands and
the sum under the hundreds write the sum under the
place. thousands place.
1 + 2 + 3 = 6 3 + 1 + 4 = 8
Th H T O Th H T O

3 1 2 3 3 1 2 3

1 2 4 2 1 2 4 2

+ 4 3 1 4 + 4 3 1 4

6 7 9 8 6 7 9

So, 3,123 + 1,242 + 4,314 = 8,679.
19