SaiBook.us Addition

Lesson Example Discussion s1 s2 s3 s4 s5 Quiz: Class Homework

Example

Title: Addition

Grade: 3-a Lesson: S1-L3

Explanation: The best way to understand addition is by looking at some examples.Take turns and read each example for easy understanding.

Examples:

Step 1a

Add 644 and 78

Write the numbers one below the other as per the places of the digits.
\$644 + 78\$
Add units place i.e.,4 + 8 = 12.So, write 2 and carry 1 to the ten’s column.

$1a$

Explanation: Arrange the number according to their place values. Start adding from the digits in ones place(4 + 8 = 12).Write 2 and carry 1 to the ten’s column..

Step 1b

Add ten’s place including carrying 1. So, it will be 4 + 7 + 1 = 12.
Write 2 and carry 1 to the hundred’s place.

$1b$

Explanation: Add the digits in the tens column along with the carryover 1.
This means, 1 (carry-over) + 4 + 7 = 12. Here the sum is 12.
The tens digit of the sum, that is, 1, will be carried to the hundreds place.

Step 1c

Add hundred’s place including carrying 1. So, it will be 6 + 1 = 7.
Now there is no carryover and we can directly write 7 in the hundredth’s column.

Therefore, the sum of 644 + 78 = 722.

$1c$

Explanation: Now, add the digits in the hundred’s place along with the carryover digit 1, that is, 1 (carry-over)+ 6 = 7.

Hence, 644 + 78 = 722.