Lesson 14

“THE POWER OF TEN” MULTIPLICATION

Objectives

After this lesson, the students are expected to:

specializing skills in multiplication;

perform multiplication easily;

develop the speed in multiplying numbers.

Example:

31 x 100 = 3 100

270 x 10 = 2 700

15 000 x 100 = 1 500 000

Example:

2 380 x 40 = 95 200

2 380 x 400 = 952 000

When the factors are is in the power of ten such as 10, 100, 1000, 10

000, 100 000 and so on and so fort, just multiply the digit that is form 1 to 9

and add the number of zeros.

When the factors are end in both zero, multiply the significant number and

used the number of zeros in both factors to the product.

WORSHEET NO. 14

NAME: ___________________________________ DATE: _____________

YEAR & SECTION: ________________________ RATING: ___________

A. Based to the power of ten, multiply the following.

1. 100 x 320 =_________ 6. 75 x 100 =_________

2. 10 x 27 = __________ 7. 56 x 10 = __________

3. 100 x 414 = ________ 8. 38 x 100 =__________

4. 176 x 100 = ________ 9. 68 x 10 000 =________

5. 39 x 1 000 = ________ 10. 59 x 1 000 =________

B. Find the product of the following.

1. 2 080 x 30 =____________ 6. 720 x 40 =____________

2. 3 150 x 60 =____________ 7. 7 230 x 50 =___________

3. 1 470 x 20 =____________ 8. 2 030 x 60=___________

4. 30 x 90 =____________ 9. 456 x 70=____________

5. 30 x 80 =____________ 10. 86 x 690=____________