Decimal Point Movement and Multiplication

This video tutorial explains how to multiply numbers by powers of ten by moving the decimal point to the right. It provides examples of multiplying by 10, 100, and 1000, demonstrating how to shift the decimal point according to the number of zeros. The video concludes with a quick summary and tips for using this method effectively.

What is the main topic discussed in the video?

• Adding decimals

• Subtracting decimals

• Multiplying by moving the decimal point

• Dividing by moving the decimal point

When multiplying by 100, how many places do you move the decimal point?

• Two places to the right

• One place to the left

• Four places to the left

• Three places to the right

In the first example, how many zeros are there in the multiplier?

• Four

• Three

• Two

• One

What is the result of moving the decimal point two places to the right in the first example?

• 8920

• 89.2

• 892

• 8.92

In the second example, how many zeros are in the multiplier?

• One

• Two

• Three

• Four

What is the result of moving the decimal point one place to the right in the second example?

• 0.761

• 761

• 76.1

• 7.61

What is the result of multiplying 7.61 by 10?

• 76.1

• 761

• 7.61

• 0.761

In the third example, how many places do you move the decimal point?

• Three

• Two

• One

• Four

What do you do after moving the decimal point three places in the third example?

• Multiply by ten

• Divide by ten

• Subtract a zero

• Add a zero

What is the final result in the third example after moving the decimal point?

• 2100

• 210

• 21

• 2.1