SaiBook.us Multiplication

Lesson Example Discussion Quiz: Class Homework

Example

Title: Multiplications

Grade: 4-a Lesson: S3-L7

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 185 by 9.

Arrange the numbers vertically.
First, multiply the digit at the one’s place by 9, i.e., 5 × 9 = 45.
Write 5 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 9. For instance, if the digit is 9, multiply it by 5, resulting in 45. Write 5 in the one’s column and carry 4 to the ten’s place column above 8.

Step: 1b

Now multiply the digit at the ten’s place by 9, i.e., 9 × 8 = 72 tens.
Now, 72 + 4 (carry over) = 76. Write 6 at the ten’s place and carry over 7 to the hundred’s place.

$1b$

Explanation: When 9 is multiplied by 8, we get 63. Now, we need to add the carry-over (4) to 72, and we get 76. Since 76 is a 2-digit number, we write 6 under the tens column and carry 7 to the hundreds column above 1.

Step: 1c

Now, multiply the number in the hundreds place by 9,i.e., 1 × 9 = 9 hundred’s.
Now, 9 + 7 (carry over) = 16. Write 16 at the hundred’s place.
Therefore,185 × 9 =1665.

$1c$

Explanation: When 1 is multiplied by 9, we get 9. Now, we need to add the carry-over 9 to 17, and we get 16. Hence,185 × 9 = 1665.