SaiBook.us Multiplication

Lesson Example Discussion Quiz: Class Homework

Example

Title: Multiplications

Grade: 4-a Lesson: S3-L5

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

Examples:

Step: 1a

Multiply 168 by 5.

Arrange the numbers vertically.
First, multiply the digit at the one’s place by 8, i.e., 8 × 5 = 40.
Write 0 in the one’s column and carry over 4 in the ten’s place."

$1a$

Explanation: In this step, multiply the digit in the one’s place by 5. For instance, if the digit is 8, multiply it by 5, resulting in 40. Write 0 in the one’s column and carry 4 to the ten’s place column above 6.

Step: 1b

Now multiply the digit at the ten’s place by 5, i.e., 5 × 6 = 30 tens.
Now, 30 + 4 (carry over) = 34. Write 4 at the ten’s place and carry over 3 to the hundred’s place."

$1b$

Explanation: When 5 is multiplied by 6, we get 30. Now, we need to add the carry-over (4) to 30, and we get 34. Since 34 is a 2-digit number, we write 4 under the tens column and carry 3 to the hundreds column above 1.

Step: 1c

Now, multiply the number in the hundreds place by 5,i.e., 1 × 5 = 5 hundred’s.
Now, 5 + 3 (carry over) = 6. Write 6 at the hundred’s place.
Therefore,168 × 5 = 840 .

$1c$

Explanation: When 1 is multiplied by 3, we get 3. Now, we need to add the carry-over 3 to 5, and we get 8. Hence,168 × 5 = 840.