SaiBook.us Multiplication

Lesson Example Discussion Quiz: Class Homework

Example

Title: Multiplications

Grade: 4-a Lesson: S3-L6

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 178 by 8.

Arrange the numbers vertically.
First, multiply the digit at the one’s place by 8, i.e., 8 × 8 = 64.
Write 4 in the one’s column and carry over 6 in the ten’s place."

$1a$

Explanation: In this step, multiply the digit in the one’s place by 8. For instance, if the digit is 8, multiply it by 8, resulting in 64. Write 4 in the one’s column and carry 6 to the ten’s place column above 7.

Step: 1b

Now multiply the digit at the ten’s place by 8, i.e., 7 × 8 = 62 tens.
Now, 56 + 4 (carry over) = 62. Write 2 at the ten’s place and carry over 6 to the hundred’s place."

$1b$

Explanation: When 7 is multiplied by 8, we get 56. Now, we need to add the carry-over (6) to 56, and we get 62. Since 62 is a 2-digit number, we write 6 under the tens column and carry 2 to the hundreds column above 1.

Step: 1c

Now, multiply the number in the hundreds place by 8,i.e., 1 × 8 = 8 hundred’s.
Now, 8 + 6 (carry over) = 14. Write 14 at the hundred’s place.
Therefore,168 × 5 =1424 .

$1c$

Explanation: When 1 is multiplied by 8, we get 8. Now, we need to add the carry-over 8 to 6, and we get 14. Hence,178 × 8 = 1424.