Decimal Point Movement in Multiplication

This lesson covers the concept of powers of 10, focusing on multiplication and division by 10 and 100. The teacher explains how moving the decimal point can simplify these operations, using examples to demonstrate the equivalence of multiplying by fractions and dividing by whole numbers. The lesson concludes with a preview of future activities.

What is the result of multiplying 250 by 1/10?

• 0.25

• 25

• 2.5

• 250

How does dividing a number by 10 affect its decimal point?

• Moves it one place to the left

• Moves it one place to the right

• Moves it two places to the left

• Does not move

What is the equivalent of multiplying by 1/100?

• Multiplying by 10

• Dividing by 10

• Dividing by 100

• Multiplying by 100

If you multiply 48 by 1/10, what is the result?

• 4.8

• 48

• 0.48

• 480

What happens to the decimal point when you multiply by 0.1?

• Moves one place to the right

• Moves two places to the left

• Does not move

• Moves one place to the left

What is 720 times 0.01?

• 720

• 72

• 7.2

• 0.72

How many places does the decimal point move when multiplying by 0.01?

• Does not move

• Three places to the left

• Two places to the left

• One place to the left

What is the result of multiplying 36 by 0.1?

• 360

• 0.36

• 36

• 3.6

When multiplying by 0.001, how many places does the decimal point move?

• Three places to the left

• Two places to the left

• Four places to the left

• One place to the left

What is the result of multiplying 9.2 by 0.001?

• 9.2

• 0.00092

• 0.092

• 0.0092