SaiBook.us Multiplication

Lesson Example Discussion Quiz: Class Homework

Example

Title: Multiplications

Grade: 4-a Lesson: S2-L2

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

Find the product of 54 x 19

Arrange the numbers in vertically.

$1a$

Explanation: Place the multiplicand 54 on top and multiplier 19 on bottom.

Step: 1b

Multiply the one’s digits on the top number by the one’s digit of the bottom number. Here the digits are 4 x 9 = 36.. write the 6 in ones column. Carryover the 3 that goes in the next place.

$1b$

Explanation: When 4 is multiplied by 9, we get 36. Write 6 in ones column. Carryover the 3 that goes to the next place.

Step: 1c

Multiply the tens digits on the top number by the ones digit of the bottom number…Here the digits are 5 x 9 = 45. Add the carryover number 3. Now 45 + 3 = 48, write this value beside the ones place digit. Here the first partial product is 486.

$1c$

Explanation: When 5 is multiplied by 9, we get 45. Add the carryover number 3. Now 45 + 3 = 48, write this value beside the one’s place digit. Here the first partial product is 486. That will be placed in one line.

Step: 1d

Multiply the ones digits on the top number by the tens digit of the bottom number…Here the digits are 4 x 1 = 4..Place the value under the first partial product in the tens column.

$1d$

Explanation: When 4 is multiplied by 1, we get 4. Place the value under the first partial product in the tens column.

Step: 1e

Multiply the tens digits on the top number by the tens digit of the bottom number. Here the digits 5 x 1 = 5. Write the value 5 under the hundreds column in the first partial product. Now the second partial product is 54.

$1e$

Explanation: When 5 is multiplied by 1, we get 5. Write the value 5 under the hundreds column in the first partial product.Here the second partial product is 54, that will be placed in another line. We have to put the 0 in the ones column

Step: 1f

Add the both first and second partial products 486 + 540 = 1026.

$1f$

Explanation: Add both of your results to get a final answer. Now need to add 486 + 540 to get 1026.