SaiBook.us Multiplication

Lesson Example Discussion Quiz: Class Homework

Example

Title: Multiplications

Grade: 4-a Lesson: S2-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

Find the product of 58 x 21

Arrange the numbers in vertically.

$1a$

Explanation: Place the multiplicand 58 on top and multiplier 21 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 8 x 1=8..write the 8 in ones column.

$1b$

Explanation: When 8 is multiplied by 1, we get 8. Write 8 in ones column.

Step: 1c

Multiply the tens digits on the top number by the ones digit of the bottom number…Here the digits are 5 x 1=5

$1c$

Explanation: When 5 is multiplied by 1, we get 5. Here the first partial product is 58. That will be placed in one line.

Step: 1d

Multiply the one’s digits on the top number by the ten digits of the bottom number…Here the digits are 8 x 2=16..write the 6 in the tens column. Carryover the 1 that goes in the next place.

$1d$

Explanation: When 8 is multiplied by 2, we get 16. write the 6 in the tens column under the first partial product. Carryover the 1 that goes to the next place.

Step: 1e

Multiply the tens digits on the top number by the tens digit of the bottom number. Here the digits 5 x 2=10. Add the carryover number 1. Now 10 + 1=11, write this value beside the one’s place digit. Here the second partial product is 116.

$1e$

Explanation: When 5 is multiplied by 2, we get 10. Add the carryover number 1. Now 10 + 1=11, write this value beside the one’s place digit.Here the second partial product is 116. that will be placed on another line. We have to put the 0 in the ones column.

Step: 1f

Add the both first and second partial products 58 + 1160=1218

$1f$

Explanation: Add both of your results to get a final answer. Now need to add 58 + 1160 to get 1218.